//-----------------------------------------------------------------------------
// name:     OSI Interface for CPLEX
// author:   Tobias Pfender
//           Konrad-Zuse-Zentrum Berlin (Germany)
//           email: pfender@zib.de
// date:     09/25/2000
// license:  this file may be freely distributed under the terms of EPL
// comments: please scan this file for '???' and read the comments
//-----------------------------------------------------------------------------
// Copyright (C) 2000, Tobias Pfender, International Business Machines
// Corporation and others.  All Rights Reserved.

#include <iostream>
#include <cassert>
#include <string>
#include <numeric>

#include "CoinPragma.hpp"

#include "OsiCpxSolverInterface.hpp"

#include "cplex.h"

// CPLEX 10.0 removed CPXERR_NO_INT_SOLN
#if !defined(CPXERR_NO_INT_SOLN)
#define CPXERR_NO_INT_SOLN CPXERR_NO_SOLN
#endif

// #define DEBUG 1

#ifdef DEBUG
#define debugMessage printf
#else
#define debugMessage \
  if (false)         \
  printf
#endif

//#############################################################################
// A couple of helper functions
//#############################################################################

inline void freeCacheDouble(double *&ptr)
{
  if (ptr != NULL) {
    delete[] ptr;
    ptr = NULL;
  }
}

inline void freeCacheChar(char *&ptr)
{
  if (ptr != NULL) {
    delete[] ptr;
    ptr = NULL;
  }
}

inline void freeCacheMatrix(CoinPackedMatrix *&ptr)
{
  if (ptr != NULL) {
    delete ptr;
    ptr = NULL;
  }
}

static inline void
checkCPXerror(int err, std::string cpxfuncname, std::string osimethod)
{
  if (err != 0) {
    char s[100];
    sprintf(s, "%s returned error %d", cpxfuncname.c_str(), err);
#ifdef DEBUG
    std::cerr << "ERROR: " << s << " (" << osimethod << " in OsiCpxSolverInterface)" << std::endl;
#endif
    throw CoinError(s, osimethod.c_str(), "OsiCpxSolverInterface");
  }
}

static bool incompletemessage = false;

static void CPXPUBLIC OsiCpxMessageCallbackPrint(CoinMessageHandler *handler, const char *msg)
{
  /* cplex adds the newlines into their message, while the coin message handler like to add its own newlines
	 * we treat the cases where there is a newline in the beginning or no newline at the end separately
	 * TODO a better way is to scan msg for newlines and to send each line to the handler separately */
  if (msg[0] == '\n') {
    if (incompletemessage) {
      *handler << CoinMessageEol;
      incompletemessage = false;
    } else
      handler->message(0, "CPX", " ", ' ') << CoinMessageEol;

    ++msg;

    if (!*msg)
      return;
  }

  size_t len = strlen(msg);
  assert(len > 0);

  if (msg[len - 1] == '\n') {
    (const_cast< char * >(msg))[len - 1] = '\0';
    if (incompletemessage) {
      *handler << msg << CoinMessageEol;
      incompletemessage = false;
    } else
      handler->message(0, "CPX", msg, ' ') << CoinMessageEol;
  } else {
    handler->message(0, "CPX", msg, ' ');
    incompletemessage = true;
  }
}

static void CPXPUBLIC OsiCpxMessageCallbackResultLog(void *handle, const char *msg)
{
  if (!*msg)
    return;

  if (handle) {
    if (((CoinMessageHandler *)handle)->logLevel() >= 1)
      OsiCpxMessageCallbackPrint((CoinMessageHandler *)handle, msg);
  } else {
    printf(msg);
  }
}

static void CPXPUBLIC OsiCpxMessageCallbackWarning(void *handle, const char *msg)
{
  if (handle) {
    if (((CoinMessageHandler *)handle)->logLevel() >= 0)
      OsiCpxMessageCallbackPrint((CoinMessageHandler *)handle, msg);
  } else {
    printf(msg);
  }
}

static void CPXPUBLIC OsiCpxMessageCallbackError(void *handle, const char *msg)
{
  if (handle) {
    OsiCpxMessageCallbackPrint((CoinMessageHandler *)handle, msg);
  } else {
    fprintf(stderr, msg);
  }
}

void OsiCpxSolverInterface::switchToLP(void)
{
  debugMessage("OsiCpxSolverInterface::switchToLP()\n");

  if (probtypemip_) {
    CPXLPptr lp = getMutableLpPtr();

#if CPX_VERSION >= 800
    assert(CPXgetprobtype(env_, lp) == CPXPROB_MILP);
#else
    assert(CPXgetprobtype(env_, lp) == CPXPROB_MIP);
#endif

    int err = CPXchgprobtype(env_, lp, CPXPROB_LP);
    checkCPXerror(err, "CPXchgprobtype", "switchToLP");
    probtypemip_ = false;
  }
}

void OsiCpxSolverInterface::switchToMIP(void)
{
  debugMessage("OsiCpxSolverInterface::switchToMIP()\n");

  if (!probtypemip_) {
    CPXLPptr lp = getMutableLpPtr();
    int nc = getNumCols();
    int *cindarray = new int[nc];

    assert(CPXgetprobtype(env_, lp) == CPXPROB_LP);
    assert(coltype_ != NULL);

    for (int i = 0; i < nc; ++i)
      cindarray[i] = i;

#if CPX_VERSION >= 800
    int err = CPXchgprobtype(env_, lp, CPXPROB_MILP);
#else
    int err = CPXchgprobtype(env_, lp, CPXPROB_MIP);
#endif
    checkCPXerror(err, "CPXchgprobtype", "switchToMIP");

    err = CPXchgctype(env_, lp, nc, cindarray, coltype_);
    checkCPXerror(err, "CPXchgctype", "switchToMIP");

    delete[] cindarray;
    probtypemip_ = true;
  }
}

void OsiCpxSolverInterface::resizeColType(int minsize)
{
  debugMessage("OsiCpxSolverInterface::resizeColType()\n");

  if (minsize > coltypesize_) {
    int newcoltypesize = 2 * coltypesize_;
    if (minsize > newcoltypesize)
      newcoltypesize = minsize;
    char *newcoltype = new char[newcoltypesize];

    if (coltype_ != NULL) {
      CoinDisjointCopyN(coltype_, coltypesize_, newcoltype);
      delete[] coltype_;
    }
    coltype_ = newcoltype;
    coltypesize_ = newcoltypesize;
  }
  assert(minsize == 0 || coltype_ != NULL);
  assert(coltypesize_ >= minsize);
}

void OsiCpxSolverInterface::freeColType()
{
  debugMessage("OsiCpxSolverInterface::freeColType()\n");

  if (coltypesize_ > 0) {
    delete[] coltype_;
    coltype_ = NULL;
    coltypesize_ = 0;
  }
  assert(coltype_ == NULL);
}

//#############################################################################
// Solve methods
//#############################################################################

void OsiCpxSolverInterface::initialSolve()
{
  debugMessage("OsiCpxSolverInterface::initialSolve()\n");

  switchToLP();

  bool takeHint;
  OsiHintStrength strength;

  int algorithm = 0;
  getHintParam(OsiDoDualInInitial, takeHint, strength);
  if (strength != OsiHintIgnore)
    algorithm = takeHint ? -1 : 1;

  int presolve = 1;
  getHintParam(OsiDoPresolveInInitial, takeHint, strength);
  if (strength != OsiHintIgnore)
    presolve = takeHint ? 1 : 0;

  CPXLPptr lp = getLpPtr(OsiCpxSolverInterface::FREECACHED_RESULTS);

  if (presolve)
    CPXsetintparam(env_, CPX_PARAM_PREIND, CPX_ON);
  else
    CPXsetintparam(env_, CPX_PARAM_PREIND, CPX_OFF);

  //  if (messageHandler()->logLevel() == 0)
  //     CPXsetintparam( env_, CPX_PARAM_SCRIND, CPX_OFF );
  //  else
  //     CPXsetintparam( env_, CPX_PARAM_SCRIND, CPX_ON );

  if (messageHandler()->logLevel() == 0)
    CPXsetintparam(env_, CPX_PARAM_SIMDISPLAY, 0);
  else if (messageHandler()->logLevel() == 1)
    CPXsetintparam(env_, CPX_PARAM_SIMDISPLAY, 1);
  else if (messageHandler()->logLevel() > 1)
    CPXsetintparam(env_, CPX_PARAM_SIMDISPLAY, 2);

  CPXsetintparam(env_, CPX_PARAM_ADVIND, !disableadvbasis);

  double objoffset;
  double primalobjlimit;
  double dualobjlimit;
  getDblParam(OsiObjOffset, objoffset);
  getDblParam(OsiPrimalObjectiveLimit, primalobjlimit);
  getDblParam(OsiDualObjectiveLimit, dualobjlimit);

  if (getObjSense() == +1) {
    if (primalobjlimit < COIN_DBL_MAX)
      CPXsetdblparam(env_, CPX_PARAM_OBJLLIM, primalobjlimit + objoffset);
    if (dualobjlimit > -COIN_DBL_MAX)
      CPXsetdblparam(env_, CPX_PARAM_OBJULIM, dualobjlimit + objoffset);
  } else {
    if (primalobjlimit > -COIN_DBL_MAX)
      CPXsetdblparam(env_, CPX_PARAM_OBJULIM, primalobjlimit + objoffset);
    if (dualobjlimit < COIN_DBL_MAX)
      CPXsetdblparam(env_, CPX_PARAM_OBJLLIM, dualobjlimit + objoffset);
  }

  int term;
  switch (algorithm) {
  default:
  case 0:
    term = CPXlpopt(env_, lp);
#if CPX_VERSION >= 800
    checkCPXerror(term, "CPXlpopt", "initialSolve");
#endif
    break;
  case 1:
    term = CPXprimopt(env_, lp);
#if CPX_VERSION >= 800
    checkCPXerror(term, "CPXprimopt", "initialSolve");
#endif
    break;
  case -1:
    term = CPXdualopt(env_, lp);
#if CPX_VERSION >= 800
    checkCPXerror(term, "CPXdualopt", "initialSolve");
#endif
    break;
  }

  /* If the problem is found infeasible during presolve, resolve it to get a 
     proper term code */
#if CPX_VERSION >= 800
  int stat = CPXgetstat(env_, getMutableLpPtr());
  if (stat == CPX_STAT_INForUNBD && presolve) {
    CPXsetintparam(env_, CPX_PARAM_PREIND, CPX_OFF);
    switch (algorithm) {
    default:
    case 0:
      term = CPXlpopt(env_, lp);
      checkCPXerror(term, "CPXlpopt", "initialSolve");
      break;
    case 1:
      term = CPXprimopt(env_, lp);
      checkCPXerror(term, "CPXprimopt", "initialSolve");
      break;
    case -1:
      term = CPXdualopt(env_, lp);
      checkCPXerror(term, "CPXdualopt", "initialSolve");
      break;
    }
    CPXsetintparam(env_, CPX_PARAM_PREIND, CPX_ON);
  }
#else
  if (term == CPXERR_PRESLV_INForUNBD && presolve) {
    CPXsetintparam(env_, CPX_PARAM_PREIND, CPX_OFF);
    switch (algorithm) {
    default:
    case 0:
      term = CPXlpopt(env_, lp);
      break;
    case 1:
      term = CPXprimopt(env_, lp);
      break;
    case -1:
      term = CPXdualopt(env_, lp);
      break;
    }
    CPXsetintparam(env_, CPX_PARAM_PREIND, CPX_ON);
  }
#endif

  disableadvbasis = false;
}
//-----------------------------------------------------------------------------
void OsiCpxSolverInterface::resolve()
{
  debugMessage("OsiCpxSolverInterface::resolve()\n");

  switchToLP();

  bool takeHint;
  OsiHintStrength strength;

  int algorithm = 0;
  getHintParam(OsiDoDualInResolve, takeHint, strength);
  if (strength != OsiHintIgnore)
    algorithm = takeHint ? -1 : 1;

  int presolve = 0;
  getHintParam(OsiDoPresolveInResolve, takeHint, strength);
  if (strength != OsiHintIgnore)
    presolve = takeHint ? 1 : 0;

  CPXLPptr lp = getLpPtr(OsiCpxSolverInterface::FREECACHED_RESULTS);

  if (presolve)
    CPXsetintparam(env_, CPX_PARAM_PREIND, CPX_ON);
  else
    CPXsetintparam(env_, CPX_PARAM_PREIND, CPX_OFF);

  //  if (messageHandler()->logLevel() == 0)
  //     CPXsetintparam( env_, CPX_PARAM_SCRIND, CPX_OFF );
  //  else
  //     CPXsetintparam( env_, CPX_PARAM_SCRIND, CPX_ON );

  if (messageHandler()->logLevel() == 0)
    CPXsetintparam(env_, CPX_PARAM_SIMDISPLAY, 0);
  else if (messageHandler()->logLevel() == 1)
    CPXsetintparam(env_, CPX_PARAM_SIMDISPLAY, 1);
  else if (messageHandler()->logLevel() > 1)
    CPXsetintparam(env_, CPX_PARAM_SIMDISPLAY, 2);

  CPXsetintparam(env_, CPX_PARAM_ADVIND, !disableadvbasis);

  int term;
  switch (algorithm) {
  default:
  case 0:
    term = CPXlpopt(env_, lp);
#if CPX_VERSION >= 800
    checkCPXerror(term, "CPXlpopt", "resolve");
#endif
    break;
  case 1:
    term = CPXprimopt(env_, lp);
#if CPX_VERSION >= 800
    checkCPXerror(term, "CPXprimopt", "resolve");
#endif
    break;
  case -1:
    term = CPXdualopt(env_, lp);
#if CPX_VERSION >= 800
    checkCPXerror(term, "CPXdualopt", "resolve");
#endif
    break;
  }

  /* If the problem is found infeasible during presolve, resolve it to get a 
     proper term code */
#if CPX_VERSION >= 800
  int stat = CPXgetstat(env_, getMutableLpPtr());
  if (stat == CPX_STAT_INForUNBD && presolve) {
    CPXsetintparam(env_, CPX_PARAM_PREIND, CPX_OFF);
    switch (algorithm) {
    default:
    case 0:
      term = CPXlpopt(env_, lp);
      checkCPXerror(term, "CPXlpopt", "resolve");
      break;
    case 1:
      term = CPXprimopt(env_, lp);
      checkCPXerror(term, "CPXprimopt", "resolve");
      break;
    case -1:
      term = CPXdualopt(env_, lp);
      checkCPXerror(term, "CPXdualopt", "resolve");
      break;
    }
    CPXsetintparam(env_, CPX_PARAM_PREIND, CPX_ON);
  }
#else
  if (term == CPXERR_PRESLV_INForUNBD && presolve) {
    CPXsetintparam(env_, CPX_PARAM_PREIND, CPX_OFF);
    switch (algorithm) {
    default:
    case 0:
      term = CPXlpopt(env_, lp);
      checkCPXerror(term, "CPXlpopt", "resolve");
      break;
    case 1:
      term = CPXprimopt(env_, lp);
      checkCPXerror(term, "CPXprimopt", "resolve");
      break;
    case -1:
      term = CPXdualopt(env_, lp);
      checkCPXerror(term, "CPXdualopt", "resolve");
      break;
    }
    CPXsetintparam(env_, CPX_PARAM_PREIND, CPX_ON);
  }
#endif

  disableadvbasis = false;
}
//-----------------------------------------------------------------------------
void OsiCpxSolverInterface::branchAndBound()
{
  int term;

  debugMessage("OsiCpxSolverInterface::branchAndBound()\n");

  switchToMIP();

  if (colsol_ != NULL && domipstart) {
    int ncols = getNumCols();
    int *ind = new int[ncols];

    CoinIotaN(ind, ncols, 0);
#if 1
    int zero = 0;
    term = CPXaddmipstarts(env_, getLpPtr(OsiCpxSolverInterface::KEEPCACHED_ALL), 1, ncols, &zero, ind, colsol_, NULL, NULL);
    checkCPXerror(term, "CPXaddmipstarts", "branchAndBound");
#else
    /* deprecated */
    term = CPXcopymipstart(env_, getLpPtr(OsiCpxSolverInterface::KEEPCACHED_ALL), ncols, ind, colsol_);
    checkCPXerror(term, "CPXcopymipstart", "branchAndBound");
#endif

    delete[] ind;

    CPXsetintparam(env_, CPX_PARAM_ADVIND, CPX_ON);
  } else
    CPXsetintparam(env_, CPX_PARAM_ADVIND, CPX_OFF);

  CPXLPptr lp = getLpPtr(OsiCpxSolverInterface::FREECACHED_RESULTS);

  //  if (messageHandler()->logLevel() == 0)
  //     CPXsetintparam( env_, CPX_PARAM_SCRIND, CPX_OFF );
  //  else
  //     CPXsetintparam( env_, CPX_PARAM_SCRIND, CPX_ON );

  if (messageHandler()->logLevel() == 0)
    CPXsetintparam(env_, CPX_PARAM_SIMDISPLAY, 0);
  else if (messageHandler()->logLevel() == 1)
    CPXsetintparam(env_, CPX_PARAM_SIMDISPLAY, 1);
  else if (messageHandler()->logLevel() > 1)
    CPXsetintparam(env_, CPX_PARAM_SIMDISPLAY, 2);

  term = CPXmipopt(env_, lp);
  checkCPXerror(term, "CPXmipopt", "branchAndBound");
}

//#############################################################################
// Parameter related methods
//#############################################################################

bool OsiCpxSolverInterface::setIntParam(OsiIntParam key, int value)
{
  debugMessage("OsiCpxSolverInterface::setIntParam(%d, %d)\n", key, value);

  bool retval = false;
  switch (key) {
  case OsiMaxNumIteration:
    retval = (CPXsetintparam(env_, CPX_PARAM_ITLIM, value) == 0); // ??? OsiMaxNumIteration == #Simplex-iterations ???
    break;
  case OsiMaxNumIterationHotStart:
    if (value >= 0) {
      hotStartMaxIteration_ = value;
      retval = true;
    } else
      retval = false;
    break;
  case OsiNameDiscipline:
    retval = OsiSolverInterface::setIntParam(key, value);
    break;
  case OsiLastIntParam:
    retval = false;
    break;
  default:
    retval = false;
    break;
  }
  return retval;
}

//-----------------------------------------------------------------------------

bool OsiCpxSolverInterface::setDblParam(OsiDblParam key, double value)
{
  debugMessage("OsiCpxSolverInterface::setDblParam(%d, %g)\n", key, value);

  bool retval = false;
  switch (key) {
  case OsiDualTolerance:
    retval = (CPXsetdblparam(env_, CPX_PARAM_EPOPT, value) == 0); // ??? OsiDualTolerance == CPLEX Optimality tolerance ???
    break;
  case OsiPrimalTolerance:
    retval = (CPXsetdblparam(env_, CPX_PARAM_EPRHS, value) == 0); // ??? OsiPrimalTolerance == CPLEX Feasibility tolerance ???
    break;
  case OsiDualObjectiveLimit:
  case OsiPrimalObjectiveLimit:
  case OsiObjOffset:
    retval = OsiSolverInterface::setDblParam(key, value);
    break;
  case OsiLastDblParam:
    retval = false;
    break;
  default:
    retval = false;
    break;
  }
  return retval;
}

//-----------------------------------------------------------------------------

bool OsiCpxSolverInterface::setStrParam(OsiStrParam key, const std::string &value)
{
  debugMessage("OsiCpxSolverInterface::setStrParam(%d, %s)\n", key, value.c_str());

  bool retval = false;
  switch (key) {
  case OsiProbName:
    OsiSolverInterface::setStrParam(key, value);
    return retval = true;
  case OsiSolverName:
    return false;
  case OsiLastStrParam:
    return false;
  default:
    return false;
  }
  return false;
}

//-----------------------------------------------------------------------------

bool OsiCpxSolverInterface::getIntParam(OsiIntParam key, int &value) const
{
  debugMessage("OsiCpxSolverInterface::getIntParam(%d)\n", key);

  bool retval = false;
  switch (key) {
  case OsiMaxNumIteration:
    retval = (CPXgetintparam(env_, CPX_PARAM_ITLIM, &value) == 0); // ??? OsiMaxNumIteration == #Simplex-iterations ???
    break;
  case OsiMaxNumIterationHotStart:
    value = hotStartMaxIteration_;
    retval = true;
    break;
  case OsiNameDiscipline:
    retval = OsiSolverInterface::getIntParam(key, value);
    break;
  case OsiLastIntParam:
    retval = false;
    break;
  default:
    retval = false;
    break;
  }
  return retval;
}

//-----------------------------------------------------------------------------

bool OsiCpxSolverInterface::getDblParam(OsiDblParam key, double &value) const
{
  debugMessage("OsiCpxSolverInterface::getDblParam(%d)\n", key);

  bool retval = false;
  switch (key) {
  case OsiDualTolerance:
    retval = (CPXgetdblparam(env_, CPX_PARAM_EPOPT, &value) == 0); // ??? OsiDualTolerance == CPLEX Optimality tolerance ???
    break;
  case OsiPrimalTolerance:
    retval = (CPXgetdblparam(env_, CPX_PARAM_EPRHS, &value) == 0); // ??? OsiPrimalTolerance == CPLEX Feasibility tolerance ???
    break;
  case OsiDualObjectiveLimit:
  case OsiPrimalObjectiveLimit:
  case OsiObjOffset:
    retval = OsiSolverInterface::getDblParam(key, value);
    break;
  case OsiLastDblParam:
    retval = false;
    break;
  default:
    retval = false;
    break;
  }
  return retval;
}

//-----------------------------------------------------------------------------

bool OsiCpxSolverInterface::getStrParam(OsiStrParam key, std::string &value) const
{
  debugMessage("OsiCpxSolverInterface::getStrParam(%d)\n", key);

  switch (key) {
  case OsiProbName:
    OsiSolverInterface::getStrParam(key, value);
    break;
  case OsiSolverName:
    value = "cplex";
    break;
  case OsiLastStrParam:
    return false;
  default:
    return false;
  }

  return true;
}

//#############################################################################
// Methods returning info on how the solution process terminated
//#############################################################################

bool OsiCpxSolverInterface::isAbandoned() const
{
  debugMessage("OsiCpxSolverInterface::isAbandoned()\n");

  int stat = CPXgetstat(env_, getMutableLpPtr());

#if CPX_VERSION >= 800
  return (stat == 0 || stat == CPX_STAT_NUM_BEST || stat == CPX_STAT_ABORT_USER);
#else
  return (stat == 0 || stat == CPX_NUM_BEST_FEAS || stat == CPX_NUM_BEST_INFEAS || stat == CPX_ABORT_FEAS || stat == CPX_ABORT_INFEAS || stat == CPX_ABORT_CROSSOVER);
#endif
}

bool OsiCpxSolverInterface::isProvenOptimal() const
{
  debugMessage("OsiCpxSolverInterface::isProvenOptimal()\n");

  int stat = CPXgetstat(env_, getMutableLpPtr());

#if CPX_VERSION >= 800
  return ((probtypemip_ == false && (stat == CPX_STAT_OPTIMAL || stat == CPX_STAT_OPTIMAL_INFEAS))
    || (probtypemip_ == true && (stat == CPXMIP_OPTIMAL || stat == CPXMIP_OPTIMAL_TOL)));
#else
  return ((probtypemip_ == false && (stat == CPX_OPTIMAL || stat == CPX_OPTIMAL_INFEAS)) || (probtypemip_ == true && stat == CPXMIP_OPTIMAL));
#endif
}

bool OsiCpxSolverInterface::isProvenPrimalInfeasible() const
{
  debugMessage("OsiCpxSolverInterface::isProvenPrimalInfeasible()\n");

  int stat = CPXgetstat(env_, getMutableLpPtr());

#if CPX_VERSION >= 800
  // In CPLEX 8, the return code is with respect
  // to the original problem, regardless of the algorithm used to solve it
  // --tkr 7/31/03
  return (stat == CPX_STAT_INFEASIBLE);
  //  return (method == CPX_ALG_PRIMAL && stat == CPX_STAT_INFEASIBLE ||
  //  method == CPX_ALG_DUAL && stat == CPX_STAT_UNBOUNDED);
#else

  int method = CPXgetmethod(env_, getMutableLpPtr());

  return ((method == CPX_ALG_PRIMAL && stat == CPX_INFEASIBLE) || (method == CPX_ALG_DUAL && stat == CPX_UNBOUNDED) || stat == CPX_ABORT_PRIM_INFEAS || stat == CPX_ABORT_PRIM_DUAL_INFEAS);
#endif
}

bool OsiCpxSolverInterface::isProvenDualInfeasible() const
{
  debugMessage("OsiCpxSolverInterface::isProvenDualInfeasible()\n");

  int stat = CPXgetstat(env_, getMutableLpPtr());

#if CPX_VERSION >= 800
  // In CPLEX 8, the return code is with respect
  // to the original problem, regardless of the algorithm used to solve it
  // --tkr 7/31/03
  return (stat == CPX_STAT_UNBOUNDED);
  //return (method == CPX_ALG_PRIMAL && stat == CPX_STAT_UNBOUNDED ||
  //	  method == CPX_ALG_DUAL && stat == CPX_STAT_INFEASIBLE);
#else

  int method = CPXgetmethod(env_, getMutableLpPtr());

  return ((method == CPX_ALG_PRIMAL && stat == CPX_UNBOUNDED) || (method == CPX_ALG_DUAL && stat == CPX_INFEASIBLE) || stat == CPX_ABORT_DUAL_INFEAS || stat == CPX_ABORT_PRIM_DUAL_INFEAS);
#endif
}

bool OsiCpxSolverInterface::isPrimalObjectiveLimitReached() const
{
  debugMessage("OsiCpxSolverInterface::isPrimalObjectiveLimitReached()\n");

  int stat = CPXgetstat(env_, getMutableLpPtr());
  int method = CPXgetmethod(env_, getMutableLpPtr());

#if CPX_VERSION >= 800
  return method == CPX_ALG_PRIMAL && stat == CPX_STAT_ABORT_OBJ_LIM;
#else
  return method == CPX_ALG_PRIMAL && stat == CPX_OBJ_LIM;
#endif
}

bool OsiCpxSolverInterface::isDualObjectiveLimitReached() const
{
  debugMessage("OsiCpxSolverInterface::isDualObjectiveLimitReached()\n");

  int stat = CPXgetstat(env_, getMutableLpPtr());
  int method = CPXgetmethod(env_, getMutableLpPtr());

#if CPX_VERSION >= 800
  return method == CPX_ALG_DUAL && stat == CPX_STAT_ABORT_OBJ_LIM;
#else
  return method == CPX_ALG_DUAL && stat == CPX_OBJ_LIM;
#endif
}

bool OsiCpxSolverInterface::isIterationLimitReached() const
{
  debugMessage("OsiCpxSolverInterface::isIterationLimitReached()\n");

  int stat = CPXgetstat(env_, getMutableLpPtr());

#if CPX_VERSION >= 800
  return stat == CPX_STAT_ABORT_IT_LIM;
#else
  return stat == CPX_IT_LIM_FEAS || stat == CPX_IT_LIM_INFEAS;
#endif
}

//#############################################################################
// WarmStart related methods
//#############################################################################

CoinWarmStart *OsiCpxSolverInterface::getEmptyWarmStart() const
{
  return (dynamic_cast< CoinWarmStart * >(new CoinWarmStartBasis()));
}

CoinWarmStart *OsiCpxSolverInterface::getWarmStart() const
{
  debugMessage("OsiCpxSolverInterface::getWarmStart()\n");

  if (probtypemip_)
    return getEmptyWarmStart();

  CoinWarmStartBasis *ws = NULL;
  int numcols = getNumCols();
  int numrows = getNumRows();
  int *cstat = new int[numcols];
  int *rstat = new int[numrows];
  char *sense = new char[numrows];
  int restat, i;

  restat = CPXgetsense(env_, getMutableLpPtr(), sense, 0, numrows - 1);
  if (restat == 0)
    restat = CPXgetbase(env_, getMutableLpPtr(), cstat, rstat);
  if (restat == 0) {
    ws = new CoinWarmStartBasis;
    ws->setSize(numcols, numrows);

    for (i = 0; i < numrows; ++i) {
      switch (rstat[i]) {
      case CPX_BASIC:
        ws->setArtifStatus(i, CoinWarmStartBasis::basic);
        break;
      case CPX_AT_LOWER:
        if (sense[i] == 'G')
          ws->setArtifStatus(i, CoinWarmStartBasis::atUpperBound);
        else
          ws->setArtifStatus(i, CoinWarmStartBasis::atLowerBound);
        break;
      case CPX_AT_UPPER:
        if (sense[i] == 'L')
          ws->setArtifStatus(i, CoinWarmStartBasis::atLowerBound);
        else
          ws->setArtifStatus(i, CoinWarmStartBasis::atUpperBound);
        break;
      default: // unknown row status
        delete ws;
        ws = NULL;
        goto TERMINATE;
      }
    }

    for (i = 0; i < numcols; ++i) {
      switch (cstat[i]) {
      case CPX_BASIC:
        ws->setStructStatus(i, CoinWarmStartBasis::basic);
        break;
      case CPX_AT_LOWER:
        ws->setStructStatus(i, CoinWarmStartBasis::atLowerBound);
        break;
      case CPX_AT_UPPER:
        ws->setStructStatus(i, CoinWarmStartBasis::atUpperBound);
        break;
      case CPX_FREE_SUPER:
        ws->setStructStatus(i, CoinWarmStartBasis::isFree);
        break;
      default: // unknown column status
        delete ws;
        ws = NULL;
        goto TERMINATE;
      }
    }
  }
TERMINATE:
  delete[] cstat;
  delete[] rstat;
  delete[] sense;

  return ws;
}

//-----------------------------------------------------------------------------

bool OsiCpxSolverInterface::setWarmStart(const CoinWarmStart *warmstart)
{
  debugMessage("OsiCpxSolverInterface::setWarmStart(%p)\n", (void *)warmstart);

  const CoinWarmStartBasis *ws = dynamic_cast< const CoinWarmStartBasis * >(warmstart);
  int numcols, numrows, i, restat;
  int *cstat, *rstat;
  bool retval = false;

  if (!ws)
    return false;

  numcols = getNumCols();
  numrows = getNumRows();

  /* if too small warm start information is given, we take this as a sign to disable a warm start in the next LP solve */
  if (ws->getNumStructural() < numcols || ws->getNumArtificial() < numrows) {
    disableadvbasis = true;
    return false;
  }

  switchToLP();

  cstat = new int[numcols];
  rstat = new int[numrows];
  for (i = 0; i < numrows; ++i) {
    switch (ws->getArtifStatus(i)) {
    case CoinWarmStartBasis::basic:
      rstat[i] = CPX_BASIC;
      break;
    case CoinWarmStartBasis::atLowerBound:
      rstat[i] = CPX_AT_LOWER;
      break;
    case CoinWarmStartBasis::atUpperBound:
      rstat[i] = CPX_AT_UPPER;
      break;
    default: // unknown row status
      retval = false;
      goto TERMINATE;
    }
  }
  for (i = 0; i < numcols; ++i) {
    switch (ws->getStructStatus(i)) {
    case CoinWarmStartBasis::basic:
      cstat[i] = CPX_BASIC;
      break;
    case CoinWarmStartBasis::atLowerBound:
      cstat[i] = CPX_AT_LOWER;
      break;
    case CoinWarmStartBasis::atUpperBound:
      cstat[i] = CPX_AT_UPPER;
      break;
    case CoinWarmStartBasis::isFree:
      cstat[i] = CPX_FREE_SUPER;
      break;
    default: // unknown row status
      retval = false;
      goto TERMINATE;
    }
  }

  // *FIXME* : can this be getMutableLpPtr() ? Does any cached data change by
  // *FIXME* : setting warmstart? Or at least wouldn't it be sufficient to
  // *FIXME* : clear the cached results but not the problem data?
  // -> is fixed by using FREECACHED_RESULTS; only cached solution will be discarded
  restat = CPXcopybase(env_, getLpPtr(OsiCpxSolverInterface::FREECACHED_RESULTS), cstat, rstat);
  retval = (restat == 0);
TERMINATE:
  delete[] cstat;
  delete[] rstat;
  return retval;
}

//#############################################################################
// Hotstart related methods (primarily used in strong branching)
//#############################################################################

void OsiCpxSolverInterface::markHotStart()
{
  debugMessage("OsiCpxSolverInterface::markHotStart()\n");

  int err;
  int numcols, numrows;

  assert(!probtypemip_);

  numcols = getNumCols();
  numrows = getNumRows();
  if (numcols > hotStartCStatSize_) {
    delete[] hotStartCStat_;
    hotStartCStatSize_ = static_cast< int >(1.2 * static_cast< double >(numcols)); // get some extra space for future hot starts
    hotStartCStat_ = new int[hotStartCStatSize_];
  }
  if (numrows > hotStartRStatSize_) {
    delete[] hotStartRStat_;
    hotStartRStatSize_ = static_cast< int >(1.2 * static_cast< double >(numrows)); // get some extra space for future hot starts
    hotStartRStat_ = new int[hotStartRStatSize_];
  }
  err = CPXgetbase(env_, getMutableLpPtr(), hotStartCStat_, hotStartRStat_);
  checkCPXerror(err, "CPXgetbase", "markHotStart");
}

void OsiCpxSolverInterface::solveFromHotStart()
{
  debugMessage("OsiCpxSolverInterface::solveFromHotStart()\n");

  int err;
  int maxiter;

  switchToLP();

  assert(getNumCols() <= hotStartCStatSize_);
  assert(getNumRows() <= hotStartRStatSize_);
  err = CPXcopybase(env_, getLpPtr(OsiCpxSolverInterface::FREECACHED_RESULTS), hotStartCStat_, hotStartRStat_);
  checkCPXerror(err, "CPXcopybase", "solveFromHotStart");

  err = CPXgetintparam(env_, CPX_PARAM_ITLIM, &maxiter);
  checkCPXerror(err, "CPXgetintparam", "solveFromHotStart");
  err = CPXsetintparam(env_, CPX_PARAM_ITLIM, hotStartMaxIteration_);
  checkCPXerror(err, "CPXsetintparam", "solveFromHotStart");

  resolve();

  err = CPXsetintparam(env_, CPX_PARAM_ITLIM, maxiter);
  checkCPXerror(err, "CPXsetintparam", "solveFromHotStart");
}

void OsiCpxSolverInterface::unmarkHotStart()
{
  debugMessage("OsiCpxSolverInterface::unmarkHotStart()\n");

  // ??? be lazy with deallocating memory and do nothing here, deallocate memory in the destructor
}

//#############################################################################
// Problem information methods (original data)
//#############################################################################

//------------------------------------------------------------------
// Get number of rows, columns, elements, ...
//------------------------------------------------------------------
int OsiCpxSolverInterface::getNumCols() const
{
  debugMessage("OsiCpxSolverInterface::getNumCols()\n");

  return CPXgetnumcols(env_, getMutableLpPtr());
}
int OsiCpxSolverInterface::getNumRows() const
{
  debugMessage("OsiCpxSolverInterface::getNumRows()\n");

  return CPXgetnumrows(env_, getMutableLpPtr());
}
CoinBigIndex OsiCpxSolverInterface::getNumElements() const
{
  debugMessage("OsiCpxSolverInterface::getNumElements()\n");

  return CPXgetnumnz(env_, getMutableLpPtr());
}

//------------------------------------------------------------------
// Get pointer to rim vectors
//------------------------------------------------------------------

const double *OsiCpxSolverInterface::getColLower() const
{
  debugMessage("OsiCpxSolverInterface::getColLower()\n");

  if (collower_ == NULL) {
    int ncols = CPXgetnumcols(env_, getMutableLpPtr());
    if (ncols > 0) {
      collower_ = new double[ncols];
      CPXgetlb(env_, getMutableLpPtr(), collower_, 0, ncols - 1);
    }
  }
  return collower_;
}
//------------------------------------------------------------------
const double *OsiCpxSolverInterface::getColUpper() const
{
  debugMessage("OsiCpxSolverInterface::getColUpper()\n");

  if (colupper_ == NULL) {
    int ncols = CPXgetnumcols(env_, getMutableLpPtr());
    if (ncols > 0) {
      colupper_ = new double[ncols];
      CPXgetub(env_, getMutableLpPtr(), colupper_, 0, ncols - 1);
    }
  }
  return colupper_;
}
//------------------------------------------------------------------
const char *OsiCpxSolverInterface::getRowSense() const
{
  debugMessage("OsiCpxSolverInterface::getRowSense()\n");

  if (rowsense_ == NULL) {
    // rowsense is determined with rhs, so invoke rhs
    getRightHandSide();
    assert(rowsense_ != NULL || getNumRows() == 0);
  }
  return rowsense_;
}
//------------------------------------------------------------------
const double *OsiCpxSolverInterface::getRightHandSide() const
{
  debugMessage("OsiCpxSolverInterface::getRightHandSide()\n");

  if (rhs_ == NULL) {
    CPXLPptr lp = getMutableLpPtr();
    int nrows = getNumRows();
    if (nrows > 0) {
      rhs_ = new double[nrows];
      CPXgetrhs(env_, lp, rhs_, 0, nrows - 1);

      assert(rowrange_ == NULL);
      rowrange_ = new double[nrows];
      CPXgetrngval(env_, lp, rowrange_, 0, nrows - 1);

      assert(rowsense_ == NULL);
      rowsense_ = new char[nrows];
      CPXgetsense(env_, lp, rowsense_, 0, nrows - 1);

      double inf = getInfinity();
      int i;
      for (i = 0; i < nrows; ++i) {
        if (rowsense_[i] != 'R')
          rowrange_[i] = 0.0;
        else {
          if (rhs_[i] <= -inf) {
            rowsense_[i] = 'N';
            rowrange_[i] = 0.0;
            rhs_[i] = 0.0;
          } else {
            if (rowrange_[i] >= 0.0)
              rhs_[i] = rhs_[i] + rowrange_[i];
            else
              rowrange_[i] = -rowrange_[i];
          }
        }
      }
    }
  }
  return rhs_;
}
//------------------------------------------------------------------
const double *OsiCpxSolverInterface::getRowRange() const
{
  debugMessage("OsiCpxSolverInterface::getRowRange()\n");

  if (rowrange_ == NULL) {
    // rowrange is determined with rhs, so invoke rhs
    getRightHandSide();
    assert(rowrange_ != NULL || getNumRows() == 0);
  }
  return rowrange_;
}
//------------------------------------------------------------------
const double *OsiCpxSolverInterface::getRowLower() const
{
  debugMessage("OsiCpxSolverInterface::getRowLower()\n");

  if (rowlower_ == NULL) {
    int nrows = getNumRows();
    const char *rowsense = getRowSense();
    const double *rhs = getRightHandSide();
    const double *rowrange = getRowRange();

    if (nrows > 0) {
      rowlower_ = new double[nrows];

      double dum1;
      for (int i = 0; i < nrows; i++)
        convertSenseToBound(rowsense[i], rhs[i], rowrange[i],
          rowlower_[i], dum1);
    }
  }
  return rowlower_;
}
//------------------------------------------------------------------
const double *OsiCpxSolverInterface::getRowUpper() const
{
  debugMessage("OsiCpxSolverInterface::getRowUpper()\n");

  if (rowupper_ == NULL) {
    int nrows = getNumRows();
    const char *rowsense = getRowSense();
    const double *rhs = getRightHandSide();
    const double *rowrange = getRowRange();

    if (nrows > 0) {
      rowupper_ = new double[nrows];

      double dum1;
      for (int i = 0; i < nrows; i++)
        convertSenseToBound(rowsense[i], rhs[i], rowrange[i],
          dum1, rowupper_[i]);
    }
  }

  return rowupper_;
}
//------------------------------------------------------------------
const double *OsiCpxSolverInterface::getObjCoefficients() const
{
  debugMessage("OsiCpxSolverInterface::getObjCoefficients()\n");

  if (obj_ == NULL) {
    int ncols = CPXgetnumcols(env_, getMutableLpPtr());
    if (ncols > 0) {
      obj_ = new double[ncols];
      int err = CPXgetobj(env_, getMutableLpPtr(), obj_, 0, ncols - 1);
      checkCPXerror(err, "CPXgetobj", "getObjCoefficients");
    }
  }
  return obj_;
}
//------------------------------------------------------------------
double OsiCpxSolverInterface::getObjSense() const
{
  debugMessage("OsiCpxSolverInterface::getObjSense()\n");

  if (CPXgetobjsen(env_, getMutableLpPtr()) == CPX_MIN)
    return +1.0;
  else
    return -1.0;
}

//------------------------------------------------------------------
// Return information on integrality
//------------------------------------------------------------------

bool OsiCpxSolverInterface::isContinuous(int colNumber) const
{
  debugMessage("OsiCpxSolverInterface::isContinuous(%d)\n", colNumber);

  return getCtype()[colNumber] == 'C';
}

//------------------------------------------------------------------
// Row and column copies of the matrix ...
//------------------------------------------------------------------

const CoinPackedMatrix *OsiCpxSolverInterface::getMatrixByRow() const
{
  debugMessage("OsiCpxSolverInterface::getMatrixByRow()\n");

  if (matrixByRow_ == NULL) {
    int nrows = getNumRows();
    int ncols = getNumCols();
    int nelems;
    int *starts = new int[nrows + 1];
    int *len = new int[nrows];

    int requiredSpace;
    CPXgetrows(env_, getMutableLpPtr(),
      &nelems, starts, NULL, NULL, 0, &requiredSpace,
      0, nrows - 1);

    assert(-requiredSpace == getNumElements());
    int *indices = new int[-requiredSpace];
    double *elements = new double[-requiredSpace];

    CPXgetrows(env_, getMutableLpPtr(),
      &nelems, starts, indices, elements, -requiredSpace,
      &requiredSpace, 0, nrows - 1);
    assert(requiredSpace == 0);

    matrixByRow_ = new CoinPackedMatrix();

    // Should be able to pass null for length of packed matrix,
    // assignMatrix does not seem to allow (even though documentation
    // say it is possible to do this).
    // For now compute the length.
    starts[nrows] = nelems;
    for (int i = 0; i < nrows; ++i)
      len[i] = starts[i + 1] - starts[i];

    matrixByRow_->assignMatrix(false /* not column ordered */,
      ncols, nrows, nelems,
      elements, indices, starts, len /*NULL*/);
  }
  return matrixByRow_;
}

//------------------------------------------------------------------

const CoinPackedMatrix *OsiCpxSolverInterface::getMatrixByCol() const
{
  debugMessage("OsiCpxSolverInterface::getMatrixByCol()\n");

  if (matrixByCol_ == NULL) {
    int nrows = getNumRows();
    int ncols = getNumCols();
    int nelems;
    int *starts = new int[ncols + 1];
    int *len = new int[ncols];

    int requiredSpace;
    CPXgetcols(env_, getMutableLpPtr(),
      &nelems, starts, NULL, NULL, 0, &requiredSpace,
      0, ncols - 1);
    assert(-requiredSpace == getNumElements());

    int *indices = new int[-requiredSpace];
    double *elements = new double[-requiredSpace];

    CPXgetcols(env_, getMutableLpPtr(),
      &nelems, starts, indices, elements, -requiredSpace,
      &requiredSpace, 0, ncols - 1);
    assert(requiredSpace == 0);

    matrixByCol_ = new CoinPackedMatrix();

    // Should be able to pass null for length of packed matrix,
    // assignMatrix does not seem to allow (even though documentation
    // say it is possible to do this).
    // For now compute the length.
    starts[ncols] = nelems;
    for (int i = 0; i < ncols; i++)
      len[i] = starts[i + 1] - starts[i];

    matrixByCol_->assignMatrix(true /* column ordered */,
      nrows, ncols, nelems,
      elements, indices, starts, len /*NULL*/);
    assert(matrixByCol_->getNumCols() == ncols);
    assert(matrixByCol_->getNumRows() == nrows);
  }
  return matrixByCol_;
}

//------------------------------------------------------------------
// Get solver's value for infinity
//------------------------------------------------------------------
double OsiCpxSolverInterface::getInfinity() const
{
  debugMessage("OsiCpxSolverInterface::getInfinity()\n");

  return CPX_INFBOUND;
}

//#############################################################################
// Problem information methods (results)
//#############################################################################

// *FIXME*: what should be done if a certain vector doesn't exist???

const double *OsiCpxSolverInterface::getColSolution() const
{
  debugMessage("OsiCpxSolverInterface::getColSolution()\n");

  if (colsol_ == NULL) {
    CPXLPptr lp = getMutableLpPtr();
    int ncols = CPXgetnumcols(env_, lp);
    if (ncols > 0) {
      colsol_ = new double[ncols];

      if (probtypemip_) {
#if CPX_VERSION >= 1100
        int solntype;
        CPXsolninfo(env_, lp, NULL, &solntype, NULL, NULL);
        if (solntype != CPX_NO_SOLN) {
          int err = CPXgetmipx(env_, lp, colsol_, 0, ncols - 1);
          checkCPXerror(err, "CPXgetmipx", "getColSolution");
        } else {
          CoinFillN(colsol_, ncols, 0.0);
        }
#else
        int err = CPXgetmipx(env_, lp, colsol_, 0, ncols - 1);
        if (err == CPXERR_NO_INT_SOLN)
          CoinFillN(colsol_, ncols, 0.0);
        else
          checkCPXerror(err, "CPXgetmipx", "getColSolution");
#endif
      } else {
        int solntype;
        CPXsolninfo(env_, lp, NULL, &solntype, NULL, NULL);
        if (solntype != CPX_NO_SOLN) {
          int err = CPXgetx(env_, lp, colsol_, 0, ncols - 1);
          checkCPXerror(err, "CPXgetx", "getColSolution");
        } else {
          CoinFillN(colsol_, ncols, 0.0);
        }
      }
    }
  }

  return colsol_;
}
//------------------------------------------------------------------
const double *OsiCpxSolverInterface::getRowPrice() const
{
  debugMessage("OsiCpxSolverInterface::getRowPrice()\n");

  if (rowsol_ == NULL) {
    int nrows = getNumRows();
    if (nrows > 0) {
      rowsol_ = new double[nrows];
      int solntype;

      /* check if a solution exists, if Cplex >= 11.0 */
#if CPX_VERSION >= 1100
      CPXsolninfo(env_, getMutableLpPtr(), NULL, &solntype, NULL, NULL);
#else
      solntype = CPX_BASIC_SOLN;
#endif

      if (solntype != CPX_NO_SOLN) {
        int err = CPXgetpi(env_, getMutableLpPtr(), rowsol_, 0, nrows - 1);
        checkCPXerror(err, "CPXgetpi", "getRowPrice");
      } else {
        CoinFillN(rowsol_, nrows, 0.0);
      }
    }
  }
  return rowsol_;
}
//------------------------------------------------------------------
const double *OsiCpxSolverInterface::getReducedCost() const
{
  debugMessage("OsiCpxSolverInterface::getReducedCost()\n");

  if (redcost_ == NULL) {
    int ncols = CPXgetnumcols(env_, getMutableLpPtr());
    if (ncols > 0) {
      redcost_ = new double[ncols];
      int solntype;

      /* check if a solution exists, if Cplex >= 11.0 */
#if CPX_VERSION >= 1100
      CPXsolninfo(env_, getMutableLpPtr(), NULL, &solntype, NULL, NULL);
#else
      solntype = CPX_BASIC_SOLN;
#endif

      if (solntype != CPX_NO_SOLN) {
        int err = CPXgetdj(env_, getMutableLpPtr(), redcost_, 0, ncols - 1);
        checkCPXerror(err, "CPXgetdj", "getReducedCost");
      } else {
        CoinFillN(redcost_, ncols, 0.0);
      }
    }
  }
  return redcost_;
}
//------------------------------------------------------------------
const double *OsiCpxSolverInterface::getRowActivity() const
{
  debugMessage("OsiCpxSolverInterface::getRowActivity()\n");

  if (rowact_ == NULL) {
    int nrows = getNumRows();
    if (nrows > 0) {
      rowact_ = new double[nrows];
      int solntype;

      if (probtypemip_) {
        /* check if a solution exists, if Cplex >= 11.0 */
#if CPX_VERSION >= 1100
        CPXsolninfo(env_, getMutableLpPtr(), NULL, &solntype, NULL, NULL);
        if (solntype != CPX_NO_SOLN) {
          double *rowslack = new double[nrows];
          int err = CPXgetmipslack(env_, getMutableLpPtr(), rowslack, 0, nrows - 1);
          checkCPXerror(err, "CPXgetmipslack", "getRowActivity");
          for (int r = 0; r < nrows; ++r)
            rowact_[r] = getRightHandSide()[r] - rowslack[r];
          delete[] rowslack;
        } else {
          CoinFillN(rowact_, nrows, 0.0);
        }
#else
        double *rowslack = new double[nrows];
        int err = CPXgetmipslack(env_, getMutableLpPtr(), rowslack, 0, nrows - 1);
        if (err == CPXERR_NO_SOLN || err == CPXERR_NO_INT_SOLN) {
          CoinFillN(rowact_, nrows, 0.0);
        } else {
          checkCPXerror(err, "CPXgetmipslack", "getRowActivity");
          for (int r = 0; r < nrows; ++r)
            rowact_[r] = getRightHandSide()[r] - rowslack[r];
        }
        delete[] rowslack;
#endif
      } else {
        CPXsolninfo(env_, getMutableLpPtr(), NULL, &solntype, NULL, NULL);
        if (solntype != CPX_NO_SOLN) {
          int err = CPXgetax(env_, getMutableLpPtr(), rowact_, 0, nrows - 1);
          checkCPXerror(err, "CPXgetax", "getRowActivity");
        } else {
          CoinFillN(rowact_, nrows, 0.0);
        }
      }
    }
  }

  return rowact_;
}
//------------------------------------------------------------------
double OsiCpxSolverInterface::getObjValue() const
{
  debugMessage("OsiCpxSolverInterface::getObjValue()\n");

  double objval = 0.0;
  int err;
  int solntype;

  CPXLPptr lp = getMutableLpPtr();

  if (probtypemip_) {
#if CPX_VERSION >= 1100
    CPXsolninfo(env_, lp, NULL, &solntype, NULL, NULL);
    if (solntype != CPX_NO_SOLN) {
      err = CPXgetmipobjval(env_, lp, &objval);
      checkCPXerror(err, "CPXgetmipobjval", "getObjValue");
    } else {
      // => return 0.0 as objective value (?? is this the correct behaviour ??)
      objval = 0.0;
    }
#else
    err = CPXgetmipobjval(env_, lp, &objval);
    if (err == CPXERR_NO_INT_SOLN)
      // => return 0.0 as objective value (?? is this the correct behaviour ??)
      objval = 0.0;
    else
      checkCPXerror(err, "CPXgetmipobjval", "getObjValue");
#endif
  } else {
    CPXsolninfo(env_, lp, NULL, &solntype, NULL, NULL);
    if (solntype != CPX_NO_SOLN) {
      err = CPXgetobjval(env_, lp, &objval);
      checkCPXerror(err, "CPXgetobjval", "getObjValue");
    } else {
      // => return 0.0 as objective value (?? is this the correct behaviour ??)
      objval = 0.0;
    }
  }

  // Adjust objective function value by constant term in objective function
  double objOffset;
  getDblParam(OsiObjOffset, objOffset);
  objval -= objOffset;

  return objval;
}
//------------------------------------------------------------------
int OsiCpxSolverInterface::getIterationCount() const
{
  debugMessage("OsiCpxSolverInterface::getIterationCount()\n");

  // CPXgetitcnt prints an error if no solution exists, so check before, if Cplex >= 11.0
#if CPX_VERSION >= 1100
  int solntype;

  CPXsolninfo(env_, getMutableLpPtr(), NULL, &solntype, NULL, NULL);

  if (solntype == CPX_NO_SOLN)
    return 0;
#endif

  if (probtypemip_)
    return CPXgetmipitcnt(env_, getMutableLpPtr());
  else
    return CPXgetitcnt(env_, getMutableLpPtr());
}
//------------------------------------------------------------------
std::vector< double * > OsiCpxSolverInterface::getDualRays(int maxNumRays,
  bool fullRay) const
{
  debugMessage("OsiCpxSolverInterface::getDualRays(%d,%s)\n", maxNumRays,
    fullRay ? "true" : "false");

  if (fullRay == true) {
    throw CoinError("Full dual rays not yet implemented.", "getDualRays",
      "OsiCpxSolverInterface");
  }

  OsiCpxSolverInterface solver(*this);

  const int numcols = getNumCols();
  const int numrows = getNumRows();
  int *index = new int[std::max(numcols, numrows)];
  int i;
  for (i = std::max(numcols, numrows) - 1; i >= 0; --i) {
    index[i] = i;
  }
  double *obj = new double[std::max(numcols, 2 * numrows)];
  CoinFillN(obj, numcols, 0.0);
  solver.setObjCoeffSet(index, index + numcols, obj);

  double *clb = new double[2 * numrows];
  double *cub = new double[2 * numrows];

  const double plusone = 1.0;
  const double minusone = -1.0;
  const char *sense = getRowSense();

  const CoinPackedVectorBase **cols = new const CoinPackedVectorBase *[2 * numrows];
  int newcols = 0;
  for (i = 0; i < numrows; ++i) {
    switch (sense[i]) {
    case 'L':
      cols[newcols++] = new CoinShallowPackedVector(1, &index[i], &minusone, false);
      break;
    case 'G':
      cols[newcols++] = new CoinShallowPackedVector(1, &index[i], &plusone, false);
      break;
    case 'R':
      cols[newcols++] = new CoinShallowPackedVector(1, &index[i], &minusone, false);
      cols[newcols++] = new CoinShallowPackedVector(1, &index[i], &plusone, false);
      break;
    case 'N':
      break;
    }
  }

  CoinFillN(obj, newcols, 1.0);
  CoinFillN(clb, newcols, 0.0);
  CoinFillN(cub, newcols, getInfinity());

  solver.addCols(newcols, cols, clb, cub, obj);
  delete[] index;
  delete[] cols;
  delete[] clb;
  delete[] cub;
  delete[] obj;

  solver.setObjSense(1.0); // minimize
  solver.initialSolve();

  const double *solverpi = solver.getRowPrice();
  double *pi = new double[numrows];
  for (i = numrows - 1; i >= 0; --i) {
    pi[i] = -solverpi[i];
  }
  return std::vector< double * >(1, pi);
}

//------------------------------------------------------------------
std::vector< double * > OsiCpxSolverInterface::getPrimalRays(int maxNumRays) const
{
  debugMessage("OsiCpxSolverInterface::getPrimalRays(%d)\n", maxNumRays);

  double *ray = new double[getNumCols()];
  int err = CPXgetray(env_, getMutableLpPtr(), ray);
  checkCPXerror(err, "CPXgetray", "getPrimalRays");
  return std::vector< double * >(1, ray);
}

//#############################################################################
// Problem modifying methods (rim vectors)
//#############################################################################

void OsiCpxSolverInterface::setObjCoeff(int elementIndex, double elementValue)
{
  debugMessage("OsiCpxSolverInterface::setObjCoeff(%d, %g)\n", elementIndex, elementValue);

  //  int err = CPXchgobj(env_, getLpPtr( OsiCpxSolverInterface::FREECACHED_COLUMN ), 1, &elementIndex, &elementValue);
  int err = CPXchgobj(env_, getLpPtr(OsiCpxSolverInterface::KEEPCACHED_PROBLEM), 1, &elementIndex, &elementValue);
  checkCPXerror(err, "CPXchgobj", "setObjCoeff");
  if (obj_ != NULL) {
    obj_[elementIndex] = elementValue;
  }
}
//-----------------------------------------------------------------------------
void OsiCpxSolverInterface::setObjCoeffSet(const int *indexFirst,
  const int *indexLast,
  const double *coeffList)
{
  debugMessage("OsiCpxSolverInterface::setObjCoeffSet(%p, %p, %p)\n", (void *)indexFirst, (void *)indexLast, (void *)coeffList);

  const long int cnt = indexLast - indexFirst;
  //   int err = CPXchgobj(env_,
  //		       getLpPtr(OsiCpxSolverInterface::FREECACHED_COLUMN), cnt,
  //		       const_cast<int*>(indexFirst),
  //		       const_cast<double*>(coeffList));
  int err = CPXchgobj(env_,
    getLpPtr(OsiCpxSolverInterface::KEEPCACHED_PROBLEM),
    static_cast< int >(cnt),
    const_cast< int * >(indexFirst),
    const_cast< double * >(coeffList));
  checkCPXerror(err, "CPXchgobj", "setObjCoeffSet");
  if (obj_ != NULL) {
    for (int i = 0; i < cnt; ++i) {
      obj_[indexFirst[i]] = coeffList[i];
    }
  }
}
//-----------------------------------------------------------------------------
void OsiCpxSolverInterface::setColLower(int elementIndex, double elementValue)
{
  debugMessage("OsiCpxSolverInterface::setColLower(%d, %g)\n", elementIndex, elementValue);

  char c = 'L';
  //  int err = CPXchgbds( env_, getLpPtr( OsiCpxSolverInterface::FREECACHED_COLUMN ), 1, &elementIndex, &c, &elementValue );
  int err = CPXchgbds(env_,
    getLpPtr(OsiCpxSolverInterface::KEEPCACHED_PROBLEM),
    1, &elementIndex, &c, &elementValue);
  checkCPXerror(err, "CPXchgbds", "setColLower");
  if (collower_ != NULL) {
    collower_[elementIndex] = elementValue;
  }
}
//-----------------------------------------------------------------------------
void OsiCpxSolverInterface::setColUpper(int elementIndex, double elementValue)
{
  debugMessage("OsiCpxSolverInterface::setColUpper(%d, %g)\n", elementIndex, elementValue);

  char c = 'U';
  //  int err = CPXchgbds( env_, getLpPtr( OsiCpxSolverInterface::FREECACHED_COLUMN ), 1, &elementIndex, &c, &elementValue );
  int err = CPXchgbds(env_,
    getLpPtr(OsiCpxSolverInterface::KEEPCACHED_PROBLEM),
    1, &elementIndex, &c, &elementValue);
  checkCPXerror(err, "CPXchgbds", "setColUpper");
  if (colupper_ != NULL) {
    colupper_[elementIndex] = elementValue;
  }
}
//-----------------------------------------------------------------------------
void OsiCpxSolverInterface::setColBounds(int elementIndex, double lower, double upper)
{
  debugMessage("OsiCpxSolverInterface::setColBounds(%d, %g, %g)\n", elementIndex, lower, upper);

  char c[2] = { 'L', 'U' };
  int ind[2];
  double bd[2];
  int err;

  ind[0] = elementIndex;
  ind[1] = elementIndex;
  bd[0] = lower;
  bd[1] = upper;
  //  err = CPXchgbds( env_, getLpPtr( OsiCpxSolverInterface::FREECACHED_COLUMN ), 2, ind, c, bd );
  err = CPXchgbds(env_,
    getLpPtr(OsiCpxSolverInterface::KEEPCACHED_PROBLEM),
    2, ind, c, bd);
  checkCPXerror(err, "CPXchgbds", "setColBounds");
  if (collower_ != NULL) {
    collower_[elementIndex] = lower;
  }
  if (colupper_ != NULL) {
    colupper_[elementIndex] = upper;
  }
}
//-----------------------------------------------------------------------------
void OsiCpxSolverInterface::setColSetBounds(const int *indexFirst,
  const int *indexLast,
  const double *boundList)
{
  debugMessage("OsiCpxSolverInterface::setColSetBounds(%p, %p, %p)\n", (void *)indexFirst, (void *)indexLast, (void *)boundList);

  const long int cnt = indexLast - indexFirst;
  if (cnt <= 0)
    return;

  char *c = new char[2 * cnt];
  int *ind = new int[2 * cnt];
  for (int i = 0; i < cnt; ++i) {
    const int j = 2 * i;
    c[j] = 'L';
    c[j + 1] = 'U';
    const int colind = indexFirst[i];
    ind[j] = colind;
    ind[j + 1] = colind;

    if (collower_ != NULL) {
      collower_[colind] = boundList[2 * i];
    }
    if (colupper_ != NULL) {
      colupper_[colind] = boundList[2 * i + 1];
    }
  }
  //   int err = CPXchgbds( env_,
  //			getLpPtr(OsiCpxSolverInterface::FREECACHED_ROW ),
  //                            2*cnt, ind, c,
  //                            const_cast<double*>(boundList) );
  int err = CPXchgbds(env_,
    getLpPtr(OsiCpxSolverInterface::KEEPCACHED_PROBLEM),
    2 * static_cast< int >(cnt), ind, c, const_cast< double * >(boundList));
  checkCPXerror(err, "CPXchgbds", "setColSetBounds");
  delete[] ind;
  delete[] c;
  // OsiSolverInterface::setColSetBounds( indexFirst, indexLast, boundList );
}
//-----------------------------------------------------------------------------
void OsiCpxSolverInterface::setRowLower(int i, double elementValue)
{
  debugMessage("OsiCpxSolverInterface::setRowLower(%d, %g)\n", i, elementValue);

  double rhs = getRightHandSide()[i];
  double range = getRowRange()[i];
  char sense = getRowSense()[i];
  double lower = 0, upper = 0;

  convertSenseToBound(sense, rhs, range, lower, upper);
  if (lower != elementValue) {
    convertBoundToSense(elementValue, upper, sense, rhs, range);
    setRowType(i, sense, rhs, range);
  }
}
//-----------------------------------------------------------------------------
void OsiCpxSolverInterface::setRowUpper(int i, double elementValue)
{
  debugMessage("OsiCpxSolverInterface::setRowUpper(%d, %g)\n", i, elementValue);

  double rhs = getRightHandSide()[i];
  double range = getRowRange()[i];
  char sense = getRowSense()[i];
  double lower = 0, upper = 0;

  convertSenseToBound(sense, rhs, range, lower, upper);
  if (upper != elementValue) {
    convertBoundToSense(lower, elementValue, sense, rhs, range);
    setRowType(i, sense, rhs, range);
  }
}
//-----------------------------------------------------------------------------
void OsiCpxSolverInterface::setRowBounds(int elementIndex, double lower, double upper)
{
  debugMessage("OsiCpxSolverInterface::setRowBounds(%d, %g, %g)\n", elementIndex, lower, upper);

  double rhs, range;
  char sense;

  convertBoundToSense(lower, upper, sense, rhs, range);
  setRowType(elementIndex, sense, rhs, range);
}
//-----------------------------------------------------------------------------
void OsiCpxSolverInterface::setRowType(int i, char sense, double rightHandSide,
  double range)
{
  debugMessage("OsiCpxSolverInterface::setRowType(%d, %c, %g, %g)\n", i, sense, rightHandSide, range);

  int err;

  // in CPLEX, ranged constraints are interpreted as rhs <= coeff*x <= rhs+range, which is different from Osi
  double cpxrhs = rightHandSide;
  if (sense == 'R') {
    assert(range >= 0.0);
    cpxrhs -= range;
  }
  if (sense == 'N') {
    sense = 'R';
    cpxrhs = -getInfinity();
    range = 2 * getInfinity();
  }

  /**************
  err = CPXchgsense( env_, getLpPtr( OsiCpxSolverInterface::FREECACHED_ROW ),
		     1, &i, &sense );
  checkCPXerror( err, "CPXchgsense", "setRowType" );
  err = CPXchgrhs( env_, getLpPtr( OsiCpxSolverInterface::FREECACHED_ROW ),
		   1, &i, &rightHandSide );
  checkCPXerror( err, "CPXchgrhs", "setRowType" );
  err = CPXchgrngval( env_, getLpPtr( OsiCpxSolverInterface::FREECACHED_ROW ),
		      1, &i, &range );
  checkCPXerror( err, "CPXchgrngval", "setRowType" );
  ***************/

  err = CPXchgsense(env_,
    getLpPtr(OsiCpxSolverInterface::KEEPCACHED_PROBLEM),
    1, &i, &sense);
  checkCPXerror(err, "CPXchgsense", "setRowType");
  if (rowsense_ != NULL) {
    rowsense_[i] = sense;
  }

  err = CPXchgrhs(env_, getLpPtr(OsiCpxSolverInterface::KEEPCACHED_PROBLEM),
    1, &i, &cpxrhs);
  checkCPXerror(err, "CPXchgrhs", "setRowType");
  if (rhs_ != NULL) {
    rhs_[i] = rightHandSide;
  }
  err = CPXchgrngval(env_,
    getLpPtr(OsiCpxSolverInterface::KEEPCACHED_PROBLEM),
    1, &i, &range);
  checkCPXerror(err, "CPXchgrngval", "setRowType");
  if (rowrange_ != NULL) {
    rowrange_[i] = range;
  }

  if (rowlower_ != NULL || rowupper_ != NULL) {
    double dummy;
    convertSenseToBound(sense, rightHandSide, range,
      rowlower_ ? rowlower_[i] : dummy,
      rowupper_ ? rowupper_[i] : dummy);
  }
}
//-----------------------------------------------------------------------------
void OsiCpxSolverInterface::setRowSetBounds(const int *indexFirst,
  const int *indexLast,
  const double *boundList)
{
  debugMessage("OsiCpxSolverInterface::setRowSetBounds(%p, %p, %p)\n", (void *)indexFirst, (void *)indexLast, (void *)boundList);

  const long int cnt = indexLast - indexFirst;
  if (cnt <= 0)
    return;

  char *sense = new char[cnt];
  double *rhs = new double[cnt];
  double *range = new double[cnt];
  for (int i = 0; i < cnt; ++i) {
    convertBoundToSense(boundList[2 * i], boundList[2 * i + 1],
      sense[i], rhs[i], range[i]);
  }
  setRowSetTypes(indexFirst, indexLast, sense, rhs, range);
  delete[] range;
  delete[] rhs;
  delete[] sense;

  //  OsiSolverInterface::setRowSetBounds( indexFirst, indexLast, boundList );
}
//-----------------------------------------------------------------------------
void OsiCpxSolverInterface::setRowSetTypes(const int *indexFirst,
  const int *indexLast,
  const char *senseList,
  const double *rhsList,
  const double *rangeList)
{
  debugMessage("OsiCpxSolverInterface::setRowSetTypes(%p, %p, %p, %p, %p)\n",
    (void *)indexFirst, (void *)indexLast, (void *)senseList, (void *)rhsList, (void *)rangeList);

  const long int cnt = indexLast - indexFirst;
  if (cnt <= 0)
    return;

  char *sense = new char[cnt];
  double *rhs = new double[cnt];
  double *range = new double[cnt];
  int *rangeind = new int[cnt];
  int rangecnt = 0;
  for (int i = 0; i < cnt; ++i) {
    sense[i] = senseList[i];
    rhs[i] = rhsList[i];
    if (sense[i] == 'R') {
      assert(rangeList[i] >= 0.0);
      rhs[i] -= rangeList[i];
      rangeind[rangecnt] = indexFirst[i];
      range[rangecnt] = rangeList[i];
      ++rangecnt;
    }
    if (sense[i] == 'N') {
      sense[i] = 'R';
      rhs[i] = -getInfinity();
      rangeind[rangecnt] = indexFirst[i];
      range[rangecnt] = 2 * getInfinity();
      ++rangecnt;
    }
  }
  int err;
  /******************
   err = CPXchgsense(env_, getLpPtr(OsiCpxSolverInterface::FREECACHED_ROW),
		     cnt, const_cast<int*>(indexFirst), sense);
   checkCPXerror( err, "CPXchgsense", "setRowSetTypes" );
   err = CPXchgrhs(env_, getLpPtr(OsiCpxSolverInterface::FREECACHED_ROW),
		   cnt, const_cast<int*>(indexFirst), rhs);
   checkCPXerror( err, "CPXchgrhs", "setRowSetTypes" );
   err = CPXchgrngval(env_, getLpPtr(OsiCpxSolverInterface::FREECACHED_ROW),
		      rangecnt, rangeind, range);
   checkCPXerror( err, "CPXchgrngval", "setRowSetTypes" );
   ********************/

  err = CPXchgsense(env_, getLpPtr(OsiCpxSolverInterface::KEEPCACHED_ROW),
    static_cast< int >(cnt), const_cast< int * >(indexFirst), sense);
  checkCPXerror(err, "CPXchgsense", "setRowSetTypes");
  err = CPXchgrhs(env_, getLpPtr(OsiCpxSolverInterface::FREECACHED_ROW),
    static_cast< int >(cnt), const_cast< int * >(indexFirst), rhs);
  checkCPXerror(err, "CPXchgrhs", "setRowSetTypes");
  err = CPXchgrngval(env_, getLpPtr(OsiCpxSolverInterface::FREECACHED_ROW),
    rangecnt, rangeind, range);
  checkCPXerror(err, "CPXchgrngval", "setRowSetTypes");

  int j;
  if (rowsense_ != NULL) {
    for (j = 0; j < cnt; j++) {
      rowsense_[indexFirst[j]] = sense[j];
    }
  }
  if (rhs_ != NULL) {
    for (j = 0; j < cnt; j++) {
      rhs_[indexFirst[j]] = rhs[j];
    }
  }
  if (rowrange_ != NULL) {
    for (j = 0; j < rangecnt; j++) {
      rowrange_[rangeind[j]] = range[j];
    }
  }
  delete[] rangeind;
  delete[] range;
  delete[] rhs;
  delete[] sense;
  //    OsiSolverInterface::setRowSetTypes( indexFirst, indexLast, senseList,
  //  				      rhsList, rangeList );
}
//#############################################################################
void OsiCpxSolverInterface::setContinuous(int index)
{
  debugMessage("OsiCpxSolverInterface::setContinuous(%d)\n", index);

  assert(coltype_ != NULL);
  assert(coltypesize_ >= getNumCols());

  coltype_[index] = 'C';

  if (probtypemip_) {
    CPXLPptr lp = getMutableLpPtr();
    int err;
    err = CPXchgctype(env_, lp, 1, &index, &coltype_[index]);
    checkCPXerror(err, "CPXchgctype", "setContinuous");
  }
}
//-----------------------------------------------------------------------------
void OsiCpxSolverInterface::setInteger(int index)
{
  debugMessage("OsiCpxSolverInterface::setInteger(%d)\n", index);

  assert(coltype_ != NULL);
  assert(coltypesize_ >= getNumCols());

  if (getColLower()[index] == 0.0 && getColUpper()[index] == 1.0)
    coltype_[index] = 'B';
  else
    coltype_[index] = 'I';

  if (probtypemip_) {
    CPXLPptr lp = getMutableLpPtr();
    int err;
    err = CPXchgctype(env_, lp, 1, &index, &coltype_[index]);
    checkCPXerror(err, "CPXchgctype", "setInteger");
  }
}
//-----------------------------------------------------------------------------
void OsiCpxSolverInterface::setContinuous(const int *indices, int len)
{
  debugMessage("OsiCpxSolverInterface::setContinuous(%p, %d)\n", (void *)indices, len);

  for (int i = 0; i < len; ++i)
    setContinuous(indices[i]);
}
//-----------------------------------------------------------------------------
void OsiCpxSolverInterface::setInteger(const int *indices, int len)
{
  debugMessage("OsiCpxSolverInterface::setInteger(%p, %d)\n", (void *)indices, len);

  for (int i = 0; i < len; ++i)
    setInteger(indices[i]);
}
//#############################################################################

void OsiCpxSolverInterface::setObjSense(double s)
{
  debugMessage("OsiCpxSolverInterface::setObjSense(%g)\n", s);

  if (s == +1.0)
    CPXchgobjsen(env_, getLpPtr(OsiCpxSolverInterface::FREECACHED_RESULTS), CPX_MIN);
  else
    CPXchgobjsen(env_, getLpPtr(OsiCpxSolverInterface::FREECACHED_RESULTS), CPX_MAX);
}

//-----------------------------------------------------------------------------

void OsiCpxSolverInterface::setColSolution(const double *cs)
{
  debugMessage("OsiCpxSolverInterface::setColSolution(%p)\n", (void *)cs);

  int nc = getNumCols();

  if (cs == NULL)
    freeCachedResults();
  else if (nc > 0) {
    // If colsol isn't allocated, then allocate it
    if (colsol_ == NULL)
      colsol_ = new double[nc];

    // Copy in new col solution.
    CoinDisjointCopyN(cs, nc, colsol_);

    // CPLEX < 7.0 doesn't support setting a col solution without a row solution
    // -> if a row solution exists or CPLEX version >= 7, then pass into CPLEX
#if CPX_VERSION < 700
    if (rowsol_ != NULL)
#endif
    {
      int err = CPXcopystart(env_, getMutableLpPtr(), NULL, NULL,
        const_cast< double * >(colsol_),
        const_cast< double * >(rowsol_),
        NULL, NULL);
      checkCPXerror(err, "CPXcopystart", "setColSolution");
    }
  }
}

//-----------------------------------------------------------------------------

void OsiCpxSolverInterface::setRowPrice(const double *rs)
{
  debugMessage("OsiCpxSolverInterface::setRowPrice(%p)\n", (void *)rs);

  int nr = getNumRows();

  if (rs == NULL)
    freeCachedResults();
  else if (nr > 0) {
    // If rowsol isn't allocated, then allocate it
    if (rowsol_ == NULL)
      rowsol_ = new double[nr];

    // Copy in new row solution.
    CoinDisjointCopyN(rs, nr, rowsol_);

    // if reduced cost exists, then pass into CPLEX
    if (redcost_ != NULL) {
      int err = CPXcopystart(env_, getMutableLpPtr(), NULL, NULL, NULL, NULL,
        const_cast< double * >(redcost_),
        const_cast< double * >(rowsol_));
      checkCPXerror(err, "CPXcopystart", "setRowPrice");
    }
  }
}

//#############################################################################
// Problem modifying methods (matrix)
//#############################################################################
void OsiCpxSolverInterface::addCol(const CoinPackedVectorBase &vec,
  const double collb, const double colub,
  const double obj)
{
  debugMessage("OsiCpxSolverInterface::addCol(%p, %g, %g, %g)\n", (void *)&vec, collb, colub, obj);

  int nc = getNumCols();
  assert(coltypesize_ >= nc);

  resizeColType(nc + 1);
  coltype_[nc] = 'C';

  int err;
  int cmatbeg[2] = { 0, vec.getNumElements() };

  err = CPXaddcols(env_, getLpPtr(OsiCpxSolverInterface::KEEPCACHED_ROW),
    1, vec.getNumElements(), const_cast< double * >(&obj),
    cmatbeg,
    const_cast< int * >(vec.getIndices()),
    const_cast< double * >(vec.getElements()),
    const_cast< double * >(&collb),
    const_cast< double * >(&colub), NULL);
  checkCPXerror(err, "CPXaddcols", "addCol");
}
//-----------------------------------------------------------------------------
void OsiCpxSolverInterface::addCols(const int numcols,
  const CoinPackedVectorBase *const *cols,
  const double *collb, const double *colub,
  const double *obj)
{
  debugMessage("OsiCpxSolverInterface::addCols(%d, %p, %p, %p, %p)\n", numcols, (void *)cols, (void *)collb, (void *)colub, (void *)obj);

  int nc = getNumCols();
  assert(coltypesize_ >= nc);

  resizeColType(nc + numcols);
  CoinFillN(&coltype_[nc], numcols, 'C');

  int i;
  int nz = 0;
  for (i = 0; i < numcols; ++i)
    nz += cols[i]->getNumElements();

  int *index = new int[nz];
  double *elem = new double[nz];
  int *start = new int[numcols + 1];

  nz = 0;
  start[0] = 0;
  for (i = 0; i < numcols; ++i) {
    const CoinPackedVectorBase *col = cols[i];
    const int len = col->getNumElements();
    CoinDisjointCopyN(col->getIndices(), len, index + nz);
    CoinDisjointCopyN(col->getElements(), len, elem + nz);
    nz += len;
    start[i + 1] = nz;
  }
  int err = CPXaddcols(env_, getLpPtr(OsiCpxSolverInterface::KEEPCACHED_ROW),
    numcols, nz, const_cast< double * >(obj),
    start, index, elem,
    const_cast< double * >(collb),
    const_cast< double * >(colub), NULL);
  checkCPXerror(err, "CPXaddcols", "addCols");

  delete[] start;
  delete[] elem;
  delete[] index;

  //    int i;
  //    for( i = 0; i < numcols; ++i )
  //      addCol( *(cols[i]), collb[i], colub[i], obj[i] );
}
//-----------------------------------------------------------------------------
void OsiCpxSolverInterface::deleteCols(const int num, const int *columnIndices)
{
  debugMessage("OsiCpxSolverInterface::deleteCols(%d, %p)\n", num, (void *)columnIndices);

  int ncols = getNumCols();
  int *delstat = new int[ncols];
  int i, err;

  CoinFillN(delstat, ncols, 0);
  for (i = 0; i < num; ++i)
    delstat[columnIndices[i]] = 1;
  err = CPXdelsetcols(env_, getLpPtr(OsiCpxSolverInterface::KEEPCACHED_ROW), delstat);
  checkCPXerror(err, "CPXdelsetcols", "deleteCols");

  for (i = 0; i < ncols; ++i) {
    assert(delstat[i] <= i);
    if (delstat[i] != -1)
      coltype_[delstat[i]] = coltype_[i];
  }

  delete[] delstat;

  //---
  //--- MVG: took from OsiClp for updating names
  //---
  int nameDiscipline;
  getIntParam(OsiNameDiscipline, nameDiscipline);
  if (num && nameDiscipline) {
    // Very clumsy (and inefficient) - need to sort and then go backwards in ? chunks
    int *indices = CoinCopyOfArray(columnIndices, num);
    std::sort(indices, indices + num);
    int num2 = num;
    while (num2) {
      int next = indices[num2 - 1];
      int firstDelete = num2 - 1;
      int i;
      for (i = num2 - 2; i >= 0; --i) {
        if (indices[i] + 1 == next) {
          --next;
          firstDelete = i;
        } else {
          break;
        }
      }
      OsiSolverInterface::deleteColNames(indices[firstDelete], num2 - firstDelete);
      num2 = firstDelete;
      assert(num2 >= 0);
    }
    delete[] indices;
  }
}

//-----------------------------------------------------------------------------
void OsiCpxSolverInterface::addRow(const CoinPackedVectorBase &vec,
  const double rowlb, const double rowub)
{
  debugMessage("OsiCpxSolverInterface::addRow(%p, %g, %g)\n", (void *)&vec, rowlb, rowub);

  char sense;
  double rhs, range;

  convertBoundToSense(rowlb, rowub, sense, rhs, range);
  addRow(vec, sense, rhs, range);
}
//-----------------------------------------------------------------------------
void OsiCpxSolverInterface::addRow(const CoinPackedVectorBase &vec,
  const char rowsen, const double rowrhs,
  const double rowrng)
{
  debugMessage("OsiCpxSolverInterface::addRow(%p, %c, %g, %g)\n", (void *)&vec, rowsen, rowrhs, rowrng);

  int err;
  int rmatbeg = 0;
  double rhs;
  double range;
  char sense = rowsen;

  switch (rowsen) {
  case 'R':
    //assert(rowrng >= 0.0);
    rhs = rowrhs - rowrng;
    range = rowrng;
    break;
  case 'N':
    sense = 'R';
    rhs = -getInfinity();
    range = 2 * getInfinity();
    break;
  default:
    rhs = rowrhs;
    range = 0.0;
  }

  err = CPXaddrows(env_, getLpPtr(OsiCpxSolverInterface::KEEPCACHED_COLUMN), 0, 1, vec.getNumElements(),
    &rhs,
    &sense,
    &rmatbeg,
    const_cast< int * >(vec.getIndices()),
    const_cast< double * >(vec.getElements()),
    NULL, NULL);
  checkCPXerror(err, "CPXaddrows", "addRow");
  if (sense == 'R') {
    int row = getNumRows() - 1;
    err = CPXchgrngval(env_, getLpPtr(OsiCpxSolverInterface::FREECACHED_ROW), 1, &row, &range);
    checkCPXerror(err, "CPXchgrngval", "addRow");
  }
}
//-----------------------------------------------------------------------------
void OsiCpxSolverInterface::addRows(const int numrows,
  const CoinPackedVectorBase *const *rows,
  const double *rowlb, const double *rowub)
{
  debugMessage("OsiCpxSolverInterface::addRows(%d, %p, %p, %p)\n", numrows, (void *)rows, (void *)rowlb, (void *)rowub);

  int i;

  for (i = 0; i < numrows; ++i)
    addRow(*(rows[i]), rowlb[i], rowub[i]);
}
//-----------------------------------------------------------------------------
void OsiCpxSolverInterface::addRows(const int numrows,
  const CoinPackedVectorBase *const *rows,
  const char *rowsen, const double *rowrhs,
  const double *rowrng)
{
  debugMessage("OsiCpxSolverInterface::addRows(%d, %p, %p, %p, %p)\n", numrows, (void *)rows, (void *)rowsen, (void *)rowrhs, (void *)rowrng);

  int i;

  for (i = 0; i < numrows; ++i)
    addRow(*(rows[i]), rowsen[i], rowrhs[i], rowrng[i]);
}
//-----------------------------------------------------------------------------
void OsiCpxSolverInterface::deleteRows(const int num, const int *rowIndices)
{
  debugMessage("OsiCpxSolverInterface::deleteRows(%d, %p)\n", num, (void *)rowIndices);

  int nrows = getNumRows();
  int *delstat = new int[nrows];
  int i, err;

  CoinFillN(delstat, nrows, 0);
  for (i = 0; i < num; ++i)
    delstat[rowIndices[i]] = 1;
  err = CPXdelsetrows(env_, getLpPtr(OsiCpxSolverInterface::KEEPCACHED_COLUMN), delstat);
  checkCPXerror(err, "CPXdelsetrows", "deleteRows");
  delete[] delstat;

  //---
  //--- SV: took from OsiClp for updating names
  //---
  int nameDiscipline;
  getIntParam(OsiNameDiscipline, nameDiscipline);
  if (num && nameDiscipline) {
    // Very clumsy (and inefficient) - need to sort and then go backwards in ? chunks
    int *indices = CoinCopyOfArray(rowIndices, num);
    std::sort(indices, indices + num);
    int num2 = num;
    while (num2) {
      int next = indices[num2 - 1];
      int firstDelete = num2 - 1;
      int i;
      for (i = num2 - 2; i >= 0; --i) {
        if (indices[i] + 1 == next) {
          --next;
          firstDelete = i;
        } else {
          break;
        }
      }
      OsiSolverInterface::deleteRowNames(indices[firstDelete], num2 - firstDelete);
      num2 = firstDelete;
      assert(num2 >= 0);
    }
    delete[] indices;
  }
}

//#############################################################################
// Methods to input a problem
//#############################################################################

void OsiCpxSolverInterface::loadProblem(const CoinPackedMatrix &matrix,
  const double *collb, const double *colub,
  const double *obj,
  const double *rowlb, const double *rowub)
{
  debugMessage("OsiCpxSolverInterface::loadProblem(1)(%p, %p, %p, %p, %p, %p)\n", (void *)&matrix, (void *)collb, (void *)colub, (void *)obj, (void *)rowlb, (void *)rowub);

  const double inf = getInfinity();

  int nrows = matrix.getNumRows();
  char *rowSense = new char[nrows];
  double *rowRhs = new double[nrows];
  double *rowRange = new double[nrows];

  int i;
  for (i = nrows - 1; i >= 0; --i) {
    const double lower = rowlb ? rowlb[i] : -inf;
    const double upper = rowub ? rowub[i] : inf;
    convertBoundToSense(lower, upper, rowSense[i], rowRhs[i], rowRange[i]);
  }

  loadProblem(matrix, collb, colub, obj, rowSense, rowRhs, rowRange);
  delete[] rowSense;
  delete[] rowRhs;
  delete[] rowRange;
}

//-----------------------------------------------------------------------------

void OsiCpxSolverInterface::assignProblem(CoinPackedMatrix *&matrix,
  double *&collb, double *&colub,
  double *&obj,
  double *&rowlb, double *&rowub)
{
  debugMessage("OsiCpxSolverInterface::assignProblem()\n");

  loadProblem(*matrix, collb, colub, obj, rowlb, rowub);
  delete matrix;
  matrix = 0;
  delete[] collb;
  collb = 0;
  delete[] colub;
  colub = 0;
  delete[] obj;
  obj = 0;
  delete[] rowlb;
  rowlb = 0;
  delete[] rowub;
  rowub = 0;
}

//-----------------------------------------------------------------------------

void OsiCpxSolverInterface::loadProblem(const CoinPackedMatrix &matrix,
  const double *collb, const double *colub,
  const double *obj,
  const char *rowsen, const double *rowrhs,
  const double *rowrng)
{
  debugMessage("OsiCpxSolverInterface::loadProblem(2)(%p, %p, %p, %p, %p, %p, %p)\n",
    (void *)&matrix, (void *)collb, (void *)colub, (void *)obj, (void *)rowsen, (void *)rowrhs, (void *)rowrng);

  char *lclRowsen = NULL;
  double *lclRowrhs = NULL;

  int nc = matrix.getNumCols();
  int nr = matrix.getNumRows();

  if (nr == 0 && nc == 0) { // empty LP
    if (lp_ != NULL) { // kill old LP
      int objDirection = CPXgetobjsen(env_, getMutableLpPtr());
      int err = CPXfreeprob(env_, &lp_);
      checkCPXerror(err, "CPXfreeprob", "loadProblem");
      lp_ = NULL;
      freeAllMemory();
      CPXchgobjsen(env_, getLpPtr(), objDirection);
    }
    return;
  }

  if (nr == 0) {
    int objDirection = CPXgetobjsen(env_, getMutableLpPtr());

    if (lp_ != NULL) { // kill old LP
      int err = CPXfreeprob(env_, &lp_);
      checkCPXerror(err, "CPXfreeprob", "loadProblem");
      lp_ = NULL;
      freeAllMemory();
    }

    // getLpPtr() call will create new LP
    int err = CPXnewcols(env_, getLpPtr(), nc, obj, collb, colub, NULL, NULL);
    checkCPXerror(err, "CPXcopylp", "loadProblem");

    CPXchgobjsen(env_, getLpPtr(), objDirection);

    resizeColType(nc);
    CoinFillN(coltype_, nc, 'C');

    return;
  }

  if (rowsen == NULL) {
    lclRowsen = new char[nr];
    CoinFillN(lclRowsen, nr, 'G');
    rowsen = lclRowsen;
  }
  if (rowrhs == NULL) {
    lclRowrhs = new double[nr];
    CoinFillN(lclRowrhs, nr, 0.0);
    rowrhs = lclRowrhs;
  }

  int i;

  // Set column values to defaults if NULL pointer passed
  double *clb;
  double *cub;
  double *ob;
  double *rr = NULL;
  double *rhs;
  if (collb != NULL)
    clb = const_cast< double * >(collb);
  else {
    clb = new double[nc];
    CoinFillN(clb, nc, 0.0);
  }
  if (colub != NULL)
    cub = const_cast< double * >(colub);
  else {
    cub = new double[nc];
    CoinFillN(cub, nc, getInfinity());
  }
  if (obj != NULL)
    ob = const_cast< double * >(obj);
  else {
    ob = new double[nc];
    CoinFillN(ob, nc, 0.0);
  }
  if (rowrng != NULL) {
    rhs = new double[nr];
    rr = new double[nr];
    for (i = 0; i < nr; i++) {
      if (rowsen[i] == 'R') {
        if (rowrng[i] >= 0) {
          rhs[i] = rowrhs[i] - rowrng[i];
          rr[i] = rowrng[i];
        } else {
          rhs[i] = rowrhs[i];
          rr[i] = -rowrng[i];
        }
      } else {
        rhs[i] = rowrhs[i];
        rr[i] = 0.0;
      }
    }
  } else
    rhs = const_cast< double * >(rowrhs);

  bool freeMatrixRequired = false;
  CoinPackedMatrix *m = NULL;
  if (!matrix.isColOrdered()) {
    m = new CoinPackedMatrix();
    m->reverseOrderedCopyOf(matrix);
    freeMatrixRequired = true;
  } else
    m = const_cast< CoinPackedMatrix * >(&matrix);

  assert(nc == m->getNumCols());
  assert(nr == m->getNumRows());
  assert(m->isColOrdered());

  int objDirection = CPXgetobjsen(env_, getMutableLpPtr());
  int err = CPXcopylp(env_, getLpPtr(),
    nc, nr,
    // Leave ObjSense alone(set to current value).
    objDirection,
    ob,
    rhs,
    const_cast< char * >(rowsen),
    const_cast< int * >(m->getVectorStarts()),
    const_cast< int * >(m->getVectorLengths()),
    const_cast< int * >(m->getIndices()),
    const_cast< double * >(m->getElements()),
    const_cast< double * >(clb),
    const_cast< double * >(cub),
    rr);
  checkCPXerror(err, "CPXcopylp", "loadProblem");

  if (collb == NULL)
    delete[] clb;
  if (colub == NULL)
    delete[] cub;
  if (obj == NULL)
    delete[] ob;
  if (rowrng != NULL) {
    delete[] rr;
    delete[] rhs;
  }

  if (freeMatrixRequired)
    delete m;

  resizeColType(nc);
  CoinFillN(coltype_, nc, 'C');

  if (lclRowsen != NULL)
    delete[] lclRowsen;
  if (lclRowrhs != NULL)
    delete[] lclRowrhs;
}

//-----------------------------------------------------------------------------

void OsiCpxSolverInterface::assignProblem(CoinPackedMatrix *&matrix,
  double *&collb, double *&colub,
  double *&obj,
  char *&rowsen, double *&rowrhs,
  double *&rowrng)
{
  debugMessage("OsiCpxSolverInterface::assignProblem()\n");

  loadProblem(*matrix, collb, colub, obj, rowsen, rowrhs, rowrng);
  delete matrix;
  matrix = 0;
  delete[] collb;
  collb = 0;
  delete[] colub;
  colub = 0;
  delete[] obj;
  obj = 0;
  delete[] rowsen;
  rowsen = 0;
  delete[] rowrhs;
  rowrhs = 0;
  delete[] rowrng;
  rowrng = 0;
}

//-----------------------------------------------------------------------------

void OsiCpxSolverInterface::loadProblem(const int numcols, const int numrows,
  const CoinBigIndex *start, const int *index,
  const double *value,
  const double *collb, const double *colub,
  const double *obj,
  const double *rowlb, const double *rowub)
{
  debugMessage("OsiCpxSolverInterface::loadProblem(3)()\n");

  const double inf = getInfinity();

  char *rowSense = new char[numrows];
  double *rowRhs = new double[numrows];
  double *rowRange = new double[numrows];

  for (int i = numrows - 1; i >= 0; --i) {
    const double lower = rowlb ? rowlb[i] : -inf;
    const double upper = rowub ? rowub[i] : inf;
    convertBoundToSense(lower, upper, rowSense[i], rowRhs[i], rowRange[i]);
  }

  loadProblem(numcols, numrows, start, index, value, collb, colub, obj,
    rowSense, rowRhs, rowRange);
  delete[] rowSense;
  delete[] rowRhs;
  delete[] rowRange;
}

//-----------------------------------------------------------------------------

void OsiCpxSolverInterface::loadProblem(const int numcols, const int numrows,
  const CoinBigIndex *start, const int *index,
  const double *value,
  const double *collb, const double *colub,
  const double *obj,
  const char *rowsen, const double *rowrhs,
  const double *rowrng)
{
  debugMessage("OsiCpxSolverInterface::loadProblem(4)(%d, %d, %p, %p, %p, %p, %p, %p, %p, %p, %p)\n",
    numcols, numrows, (void *)start, (void *)index, (void *)value, (void *)collb, (void *)colub, (void *)obj, (void *)rowsen, (void *)rowrhs, (void *)rowrng);

  const int nc = numcols;
  const int nr = numrows;

  if (nr == 0 && nc == 0) {
    // empty LP
    if (lp_ != NULL) { // kill old LP
      int objDirection = CPXgetobjsen(env_, getMutableLpPtr());
      int err = CPXfreeprob(env_, &lp_);
      checkCPXerror(err, "CPXfreeprob", "loadProblem");
      lp_ = NULL;
      freeAllMemory();
      CPXchgobjsen(env_, getLpPtr(), objDirection);
    }
    return;
  }

  if (nr == 0) {
    int objDirection = CPXgetobjsen(env_, getMutableLpPtr());

    if (lp_ != NULL) { // kill old LP
      int err = CPXfreeprob(env_, &lp_);
      checkCPXerror(err, "CPXfreeprob", "loadProblem");
      lp_ = NULL;
      freeAllMemory();
    }

    // getLpPtr() call will create new LP
    int err = CPXnewcols(env_, getLpPtr(), nc, obj, collb, colub, NULL, NULL);
    checkCPXerror(err, "CPXcopylp", "loadProblem");

    CPXchgobjsen(env_, getLpPtr(), objDirection);

    return;
  }

  char *lclRowsen = NULL;
  double *lclRowrhs = NULL;

  if (rowsen == NULL) {
    lclRowsen = new char[nr];
    CoinFillN(lclRowsen, nr, 'G');
    rowsen = lclRowsen;
  }
  if (rowrhs == NULL) {
    lclRowrhs = new double[nr];
    CoinFillN(lclRowrhs, nr, 0.0);
  }

  int i;

  // Set column values to defaults if NULL pointer passed
  int *len = new int[nc];
  double *clb = new double[nc];
  double *cub = new double[nc];
  double *ob = new double[nc];
  double *rr = new double[nr];
  double *rhs = new double[nr];
  char *sen = new char[nr];

  for (i = 0; i < nc; ++i) {
    len[i] = start[i + 1] - start[i];
  }

  if (collb != NULL)
    CoinDisjointCopyN(collb, nc, clb);
  else
    CoinFillN(clb, nc, 0.0);

  if (colub != NULL)
    CoinDisjointCopyN(colub, nc, cub);
  else
    CoinFillN(cub, nc, getInfinity());

  if (obj != NULL)
    CoinDisjointCopyN(obj, nc, ob);
  else
    CoinFillN(ob, nc, 0.0);

  if (rowrng != NULL) {
    for (i = 0; i < nr; i++) {
      if (rowsen[i] == 'R') {
        if (rowrng[i] >= 0) {
          rhs[i] = rowrhs[i] - rowrng[i];
          rr[i] = rowrng[i];
        } else {
          rhs[i] = rowrhs[i];
          rr[i] = -rowrng[i];
        }
      } else {
        rhs[i] = rowrhs[i];
        rr[i] = 0.0;
      }
    }
  } else {
    CoinDisjointCopyN(rowrhs, nr, rhs);
  }

  CoinDisjointCopyN(rowsen, nr, sen);

  int objDirection = CPXgetobjsen(env_, getMutableLpPtr());

  int err = CPXcopylp(env_, getLpPtr(),
    nc, nr,
    // Leave ObjSense alone(set to current value).
    objDirection, ob, rhs, sen,
    const_cast< int * >(start),
    len, const_cast< int * >(index),
    const_cast< double * >(value),
    clb, cub, rr);

  checkCPXerror(err, "CPXcopylp", "loadProblem");

  delete[] len;
  delete[] clb;
  delete[] cub;
  delete[] ob;
  delete[] rr;
  delete[] rhs;
  delete[] sen;

  if (lclRowsen != NULL)
    delete[] lclRowsen;
  if (lclRowrhs != NULL)
    delete[] lclRowrhs;

  resizeColType(nc);
  CoinFillN(coltype_, nc, 'C');
}

//-----------------------------------------------------------------------------
// Read mps files
//-----------------------------------------------------------------------------
int OsiCpxSolverInterface::readMps(const char *filename,
  const char *extension)
{
  debugMessage("OsiCpxSolverInterface::readMps(%s, %s)\n", filename, extension);

#if 0
  std::string f(filename);
  std::string e(extension);
  std::string fullname = f + "." + e;
  int err = CPXreadcopyprob( env_, getLpPtr(), const_cast<char*>( fullname.c_str() ), NULL );
  checkCPXerror( err, "CPXreadcopyprob", "readMps" );
#endif
  // just call base class method
  return OsiSolverInterface::readMps(filename, extension);
}

//-----------------------------------------------------------------------------
// Write mps files
//-----------------------------------------------------------------------------
void OsiCpxSolverInterface::writeMps(const char *filename,
  const char *extension,
  double objSense) const
{
  debugMessage("OsiCpxSolverInterface::writeMps(%s, %s, %g)\n", filename, extension, objSense);

  // *FIXME* : this will not output ctype information to the MPS file
  char filetype[4] = "MPS";
  std::string f(filename);
  std::string e(extension);
  std::string fullname = f + "." + e;
  int err = CPXwriteprob(env_, getMutableLpPtr(), const_cast< char * >(fullname.c_str()), filetype);
  checkCPXerror(err, "CPXwriteprob", "writeMps");
}

void OsiCpxSolverInterface::passInMessageHandler(CoinMessageHandler *handler)
{
  int err;
  CPXCHANNELptr cpxresults;
  CPXCHANNELptr cpxwarning;
  CPXCHANNELptr cpxerror;
  CPXCHANNELptr cpxlog;
  err = CPXgetchannels(env_, &cpxresults, &cpxwarning, &cpxerror, &cpxlog);
  checkCPXerror(err, "CPXgetchannels", "gutsOfConstructor");

  err = CPXdelfuncdest(env_, cpxresults, messageHandler(), OsiCpxMessageCallbackResultLog);
  checkCPXerror(err, "CPXdelfuncdest", "gutsOfConstructor");
  err = CPXdelfuncdest(env_, cpxlog, messageHandler(), OsiCpxMessageCallbackResultLog);
  checkCPXerror(err, "CPXdelfuncdest", "gutsOfConstructor");
  err = CPXdelfuncdest(env_, cpxwarning, messageHandler(), OsiCpxMessageCallbackWarning);
  checkCPXerror(err, "CPXdelfuncdest", "gutsOfConstructor");
  err = CPXdelfuncdest(env_, cpxerror, messageHandler(), OsiCpxMessageCallbackError);
  checkCPXerror(err, "CPXdelfuncdest", "gutsOfConstructor");

  OsiSolverInterface::passInMessageHandler(handler);

  err = CPXaddfuncdest(env_, cpxresults, messageHandler(), OsiCpxMessageCallbackResultLog);
  checkCPXerror(err, "CPXaddfuncdest", "gutsOfConstructor");
  err = CPXaddfuncdest(env_, cpxlog, messageHandler(), OsiCpxMessageCallbackResultLog);
  checkCPXerror(err, "CPXaddfuncdest", "gutsOfConstructor");
  err = CPXaddfuncdest(env_, cpxwarning, messageHandler(), OsiCpxMessageCallbackWarning);
  checkCPXerror(err, "CPXaddfuncdest", "gutsOfConstructor");
  err = CPXaddfuncdest(env_, cpxerror, messageHandler(), OsiCpxMessageCallbackError);
  checkCPXerror(err, "CPXaddfuncdest", "gutsOfConstructor");
}

//#############################################################################
// CPX specific public interfaces
//#############################################################################

CPXENVptr OsiCpxSolverInterface::getEnvironmentPtr()
{
  assert(env_ != NULL);
  return env_;
}

CPXLPptr OsiCpxSolverInterface::getLpPtr(int keepCached)
{
  freeCachedData(keepCached);
  return getMutableLpPtr();
}

//-----------------------------------------------------------------------------

const char *OsiCpxSolverInterface::getCtype() const
{
  debugMessage("OsiCpxSolverInterface::getCtype()\n");

  return coltype_;
}

//#############################################################################
// Constructors, destructors clone and assignment
//#############################################################################

//-------------------------------------------------------------------
// Default Constructor
//-------------------------------------------------------------------
OsiCpxSolverInterface::OsiCpxSolverInterface()
  : OsiSolverInterface()
  , env_(NULL)
  , lp_(NULL)
  , hotStartCStat_(NULL)
  , hotStartCStatSize_(0)
  , hotStartRStat_(NULL)
  , hotStartRStatSize_(0)
  , hotStartMaxIteration_(1000000)
  , // ??? default iteration limit for strong branching is large
  obj_(NULL)
  , collower_(NULL)
  , colupper_(NULL)
  , rowsense_(NULL)
  , rhs_(NULL)
  , rowrange_(NULL)
  , rowlower_(NULL)
  , rowupper_(NULL)
  , colsol_(NULL)
  , rowsol_(NULL)
  , redcost_(NULL)
  , rowact_(NULL)
  , matrixByRow_(NULL)
  , matrixByCol_(NULL)
  , coltype_(NULL)
  , coltypesize_(0)
  , probtypemip_(false)
  , domipstart(false)
  , disableadvbasis(false)
{
  debugMessage("OsiCpxSolverInterface::OsiCpxSolverInterface()\n");

  gutsOfConstructor();
}

//----------------------------------------------------------------
// Clone
//----------------------------------------------------------------
OsiSolverInterface *OsiCpxSolverInterface::clone(bool copyData) const
{
  debugMessage("OsiCpxSolverInterface::clone(%d)\n", copyData);

  return (new OsiCpxSolverInterface(*this));
}

//-------------------------------------------------------------------
// Copy constructor
//-------------------------------------------------------------------
OsiCpxSolverInterface::OsiCpxSolverInterface(const OsiCpxSolverInterface &source)
  : OsiSolverInterface(source)
  , env_(NULL)
  , lp_(NULL)
  , hotStartCStat_(NULL)
  , hotStartCStatSize_(0)
  , hotStartRStat_(NULL)
  , hotStartRStatSize_(0)
  , hotStartMaxIteration_(source.hotStartMaxIteration_)
  , obj_(NULL)
  , collower_(NULL)
  , colupper_(NULL)
  , rowsense_(NULL)
  , rhs_(NULL)
  , rowrange_(NULL)
  , rowlower_(NULL)
  , rowupper_(NULL)
  , colsol_(NULL)
  , rowsol_(NULL)
  , redcost_(NULL)
  , rowact_(NULL)
  , matrixByRow_(NULL)
  , matrixByCol_(NULL)
  , coltype_(NULL)
  , coltypesize_(0)
  , probtypemip_(false)
  , domipstart(false)
  , disableadvbasis(false)
{
  debugMessage("OsiCpxSolverInterface::OsiCpxSolverInterface(%p)\n", (void *)&source);

  gutsOfConstructor();
  gutsOfCopy(source);
}

//-------------------------------------------------------------------
// Destructor
//-------------------------------------------------------------------
OsiCpxSolverInterface::~OsiCpxSolverInterface()
{
  debugMessage("OsiCpxSolverInterface::~OsiCpxSolverInterface()\n");

  gutsOfDestructor();
}

//----------------------------------------------------------------
// Assignment operator
//-------------------------------------------------------------------
OsiCpxSolverInterface &OsiCpxSolverInterface::operator=(const OsiCpxSolverInterface &rhs)
{
  debugMessage("OsiCpxSolverInterface::operator=(%p)\n", (void *)&rhs);

  if (this != &rhs) {
    OsiSolverInterface::operator=(rhs);
    gutsOfDestructor();
    gutsOfConstructor();
    if (rhs.lp_ != NULL)
      gutsOfCopy(rhs);
  }
  return *this;
}

//#############################################################################
// Applying cuts
//#############################################################################

void OsiCpxSolverInterface::applyColCut(const OsiColCut &cc)
{
  debugMessage("OsiCpxSolverInterface::applyColCut(%p)\n", (void *)&cc);

  const double *cplexColLB = getColLower();
  const double *cplexColUB = getColUpper();
  const CoinPackedVector &lbs = cc.lbs();
  const CoinPackedVector &ubs = cc.ubs();
  int i;

  for (i = 0; i < lbs.getNumElements(); ++i)
    if (lbs.getElements()[i] > cplexColLB[lbs.getIndices()[i]])
      setColLower(lbs.getIndices()[i], lbs.getElements()[i]);
  for (i = 0; i < ubs.getNumElements(); ++i)
    if (ubs.getElements()[i] < cplexColUB[ubs.getIndices()[i]])
      setColUpper(ubs.getIndices()[i], ubs.getElements()[i]);
}

//-----------------------------------------------------------------------------

void OsiCpxSolverInterface::applyRowCut(const OsiRowCut &rowCut)
{
  debugMessage("OsiCpxSolverInterface::applyRowCut(%p)\n", (void *)&rowCut);

  int err = 0;
  double rhs = 0.0;
  double rng = 0.0;
  char sns;
  double lb = rowCut.lb();
  double ub = rowCut.ub();
  if (lb <= -getInfinity() && ub >= getInfinity()) // free constraint
  {
    rhs = -getInfinity();
    rng = 2 * getInfinity(); // CPLEX doesn't support free constraints
    sns = 'R'; // -> implement them as ranged rows with infinite bounds
  } else if (lb <= -getInfinity()) // <= constraint
  {
    rhs = ub;
    sns = 'L';
  } else if (ub >= getInfinity()) // >= constraint
  {
    rhs = lb;
    sns = 'G';
  } else if (ub == lb) // = constraint
  {
    rhs = ub;
    sns = 'E';
  } else // range constraint
  {
    rhs = lb;
    rng = ub - lb;
    sns = 'R';
  }
  int rmatbeg = 0;
  err = CPXaddrows(env_, getLpPtr(OsiCpxSolverInterface::KEEPCACHED_COLUMN), 0, 1, rowCut.row().getNumElements(),
    &rhs, &sns, &rmatbeg,
    const_cast< int * >(rowCut.row().getIndices()),
    const_cast< double * >(rowCut.row().getElements()),
    NULL, NULL);
  checkCPXerror(err, "CPXaddrows", "applyRowCut");
  if (sns == 'R') {
    err = CPXchgcoef(env_, getLpPtr(OsiCpxSolverInterface::KEEPCACHED_COLUMN),
      CPXgetnumrows(env_, getLpPtr(OsiCpxSolverInterface::KEEPCACHED_COLUMN)) - 1,
      -2, rng);
    checkCPXerror(err, "CPXchgcoef", "applyRowCut");
  }
}

//#############################################################################
// Private methods (non-static and static) and static data
//#############################################################################

//-------------------------------------------------------------------
// Get pointer to CPXLPptr.
// const methods should use getMutableLpPtr().
// non-const methods should use getLpPtr().
//-------------------------------------------------------------------
CPXLPptr OsiCpxSolverInterface::getMutableLpPtr() const
{
  if (lp_ == NULL) {
    int err;
    assert(env_ != NULL);
#if 0
      //char pn[] = "OSI_CPLEX";
      lp_ = CPXcreateprob( env_, &err, pn );
#else
    std::string pn;
    getStrParam(OsiProbName, pn);
    lp_ = CPXcreateprob(env_, &err, const_cast< char * >(pn.c_str()));
#endif
    checkCPXerror(err, "CPXcreateprob", "getMutableLpPtr");
    //      err = CPXchgprobtype(env_,lp_,CPXPROB_LP);
    //      checkCPXerror( err, "CPXchgprobtype", "getMutableLpPtr" );
    assert(lp_ != NULL);
  }
  return lp_;
}

//-------------------------------------------------------------------
CPXENVptr OsiCpxSolverInterface::getMutableEnvironmentPtr() const
{
  assert(env_ != NULL);
  return env_;
}

//-------------------------------------------------------------------

void OsiCpxSolverInterface::gutsOfCopy(const OsiCpxSolverInterface &source)
{
  // Set Objective Sense
  setObjSense(source.getObjSense());

  // Set Rim and constraints
  const double *obj = source.getObjCoefficients();
  const double *rhs = source.getRightHandSide();
  const char *sense = source.getRowSense();
  const CoinPackedMatrix *cols = source.getMatrixByCol();
  const double *lb = source.getColLower();
  const double *ub = source.getColUpper();
  loadProblem(*cols, lb, ub, obj, sense, rhs, source.getRowRange());

  // Set MIP information
  resizeColType(source.coltypesize_);
  CoinDisjointCopyN(source.coltype_, source.coltypesize_, coltype_);

  // Set Solution
  setColSolution(source.getColSolution());
  setRowPrice(source.getRowPrice());

  // Should also copy row and col names.
#if 0
  char** cname = new char*[numcols];
  char* cnamestore = NULL;
  int surplus;
  err = CPXgetcolname( env_, source.lp_, cname, NULL, 0, &surplus, 0, numcols-1 );
  if( err != CPXERR_NO_NAMES )
    {
      cnamestore = new char[-surplus];
      err = CPXgetcolname( env_, source.lp_, cname, cnamestore, -surplus, &surplus, 0, numcols-1 );
      checkCPXerror( err, "CPXgetcolname", "gutsOfCopy" );
      assert( surplus == 0 );
    }
  else
    {
      delete [] cname;
      cname = NULL;
    }
  
  char** rname = new char*[numrows];
  char* rnamestore = NULL;
  err = CPXgetrowname( env_, source.lp_, rname, NULL, 0, &surplus, 0, numrows-1 );
  if( err != CPXERR_NO_NAMES )
    {
      rnamestore = new char[-surplus];
      err = CPXgetrowname( env_, source.lp_, rname, rnamestore, -surplus, &surplus, 0, numrows-1 );
      checkCPXerror( err, "CPXgetrowname", "gutsOfCopy" );
      assert( surplus == 0 );
    }
  else
    {
      delete [] rname;
      rname = NULL;
    }

  err = CPXcopylpwnames( env_, getLpPtr(), 
			 numcols, numrows, objsen, 
			 const_cast<double *>(obj), 
			 const_cast<double *>(rhs), 
			 const_cast<char *>(sense),
			 const_cast<int *>(cols->vectorStarts()),
			 const_cast<int *>(cols->vectorLengths()),
			 const_cast<int *>(cols->indices()),
			 const_cast<double *>(cols->elements()),
			 const_cast<double *>(lb), 
			 const_cast<double *>(ub), 
			 rng, 
			 cname, rname);
  checkCPXerror( err, "CPXcopylpwnames", "gutsOfCopy" );
  
  if( rname != NULL )
    {
      delete [] rnamestore;
      delete [] rname;
    }
  if( cname != NULL )
    {
      delete [] cnamestore;
      delete [] cname;
    }
  delete [] rng;
#endif
}

//-------------------------------------------------------------------
void OsiCpxSolverInterface::gutsOfConstructor()
{
  int err;
#if CPX_VERSION >= 800
  env_ = CPXopenCPLEX(&err);
#else
  env_ = CPXopenCPLEXdevelop(&err);
#endif

  checkCPXerror(err, "CPXopenCPLEXdevelop", "gutsOfConstructor");
  assert(env_ != NULL);

  CPXCHANNELptr cpxresults;
  CPXCHANNELptr cpxwarning;
  CPXCHANNELptr cpxerror;
  CPXCHANNELptr cpxlog;
  err = CPXgetchannels(env_, &cpxresults, &cpxwarning, &cpxerror, &cpxlog);
  checkCPXerror(err, "CPXgetchannels", "gutsOfConstructor");

  err = CPXaddfuncdest(env_, cpxresults, messageHandler(), OsiCpxMessageCallbackResultLog);
  checkCPXerror(err, "CPXaddfuncdest", "gutsOfConstructor");
  err = CPXaddfuncdest(env_, cpxlog, messageHandler(), OsiCpxMessageCallbackResultLog);
  checkCPXerror(err, "CPXaddfuncdest", "gutsOfConstructor");
  err = CPXaddfuncdest(env_, cpxwarning, messageHandler(), OsiCpxMessageCallbackWarning);
  checkCPXerror(err, "CPXaddfuncdest", "gutsOfConstructor");
  err = CPXaddfuncdest(env_, cpxerror, messageHandler(), OsiCpxMessageCallbackError);
  checkCPXerror(err, "CPXaddfuncdest", "gutsOfConstructor");

  /* turn off all output to screen */
  err = CPXsetintparam(env_, CPX_PARAM_SCRIND, CPX_OFF);
  checkCPXerror(err, "CPXsetintparam", "gutsOfConstructor");

#if 0
  // CPXcreateprob was moved to getLpPtr() method.
  lp_ = CPXcreateprob( env_, &err, "OSI_CPLEX" );
  checkCPXerror( err, "CPXcreateprob", "gutsOfConstructor" );
//  err = CPXchgprobtype(env_,lp_,CPXPROB_LP);
//  checkCPXerror( err, "CPXchgprobtype", "getMutableLpPtr" );
  assert( lp_ != NULL );
#endif
}

//-------------------------------------------------------------------
void OsiCpxSolverInterface::gutsOfDestructor()
{
  if (lp_ != NULL) {
    int err = CPXfreeprob(env_, &lp_);
    checkCPXerror(err, "CPXfreeprob", "gutsOfDestructor");
    lp_ = NULL;
    freeAllMemory();
  }

  if (env_ != NULL) {
    int err = CPXcloseCPLEX(&env_);
    checkCPXerror(err, "CPXcloseCPLEX", "gutsOfDestructor");
    env_ = NULL;
  }

  assert(lp_ == NULL);
  assert(env_ == NULL);
  assert(obj_ == NULL);
  assert(collower_ == NULL);
  assert(colupper_ == NULL);
  assert(rowsense_ == NULL);
  assert(rhs_ == NULL);
  assert(rowrange_ == NULL);
  assert(rowlower_ == NULL);
  assert(rowupper_ == NULL);
  assert(colsol_ == NULL);
  assert(rowsol_ == NULL);
  assert(redcost_ == NULL);
  assert(rowact_ == NULL);
  assert(matrixByRow_ == NULL);
  assert(matrixByCol_ == NULL);
  assert(coltype_ == NULL);
  assert(coltypesize_ == 0);
}

//-------------------------------------------------------------------
/// free cached vectors

void OsiCpxSolverInterface::freeCachedColRim()
{
  freeCacheDouble(obj_);
  freeCacheDouble(collower_);
  freeCacheDouble(colupper_);
  assert(obj_ == NULL);
  assert(collower_ == NULL);
  assert(colupper_ == NULL);
}

void OsiCpxSolverInterface::freeCachedRowRim()
{
  freeCacheChar(rowsense_);
  freeCacheDouble(rhs_);
  freeCacheDouble(rowrange_);
  freeCacheDouble(rowlower_);
  freeCacheDouble(rowupper_);
  assert(rowsense_ == NULL);
  assert(rhs_ == NULL);
  assert(rowrange_ == NULL);
  assert(rowlower_ == NULL);
  assert(rowupper_ == NULL);
}

void OsiCpxSolverInterface::freeCachedMatrix()
{
  freeCacheMatrix(matrixByRow_);
  freeCacheMatrix(matrixByCol_);
  assert(matrixByRow_ == NULL);
  assert(matrixByCol_ == NULL);
}

void OsiCpxSolverInterface::freeCachedResults()
{
  freeCacheDouble(colsol_);
  freeCacheDouble(rowsol_);
  freeCacheDouble(redcost_);
  freeCacheDouble(rowact_);
  assert(colsol_ == NULL);
  assert(rowsol_ == NULL);
  assert(redcost_ == NULL);
  assert(rowact_ == NULL);
}

void OsiCpxSolverInterface::freeCachedData(int keepCached)
{
  if (!(keepCached & OsiCpxSolverInterface::KEEPCACHED_COLUMN))
    freeCachedColRim();
  if (!(keepCached & OsiCpxSolverInterface::KEEPCACHED_ROW))
    freeCachedRowRim();
  if (!(keepCached & OsiCpxSolverInterface::KEEPCACHED_MATRIX))
    freeCachedMatrix();
  if (!(keepCached & OsiCpxSolverInterface::KEEPCACHED_RESULTS))
    freeCachedResults();
}

void OsiCpxSolverInterface::freeAllMemory()
{
  freeCachedData();
  if (hotStartCStat_ != NULL)
    delete[] hotStartCStat_;
  if (hotStartRStat_ != NULL)
    delete[] hotStartRStat_;
  hotStartCStat_ = NULL;
  hotStartCStatSize_ = 0;
  hotStartRStat_ = NULL;
  hotStartRStatSize_ = 0;
  freeColType();
}

//#############################################################################
// Resets as if default constructor
void OsiCpxSolverInterface::reset()
{
  int err;
  CPXCHANNELptr cpxresults;
  CPXCHANNELptr cpxwarning;
  CPXCHANNELptr cpxerror;
  CPXCHANNELptr cpxlog;

  err = CPXgetchannels(env_, &cpxresults, &cpxwarning, &cpxerror, &cpxlog);

  err = CPXdelfuncdest(env_, cpxresults, messageHandler(), OsiCpxMessageCallbackResultLog);
  checkCPXerror(err, "CPXdelfuncdest", "reset");
  err = CPXdelfuncdest(env_, cpxlog, messageHandler(), OsiCpxMessageCallbackResultLog);
  checkCPXerror(err, "CPXdelfuncdest", "reset");
  err = CPXdelfuncdest(env_, cpxwarning, messageHandler(), OsiCpxMessageCallbackWarning);
  checkCPXerror(err, "CPXdelfuncdest", "reset");
  err = CPXdelfuncdest(env_, cpxerror, messageHandler(), OsiCpxMessageCallbackError);
  checkCPXerror(err, "CPXdelfuncdest", "reset");

  setInitialData(); // clear base class (this may reset the message handler, too)

  err = CPXaddfuncdest(env_, cpxresults, messageHandler(), OsiCpxMessageCallbackResultLog);
  checkCPXerror(err, "CPXaddfuncdest", "reset");
  err = CPXaddfuncdest(env_, cpxlog, messageHandler(), OsiCpxMessageCallbackResultLog);
  checkCPXerror(err, "CPXaddfuncdest", "reset");
  err = CPXaddfuncdest(env_, cpxwarning, messageHandler(), OsiCpxMessageCallbackWarning);
  checkCPXerror(err, "CPXaddfuncdest", "reset");
  err = CPXaddfuncdest(env_, cpxerror, messageHandler(), OsiCpxMessageCallbackError);
  checkCPXerror(err, "CPXaddfuncdest", "reset");

  if (lp_ != NULL) { // kill old LP
    int err = CPXfreeprob(env_, &lp_);
    checkCPXerror(err, "CPXfreeprob", "loadProblem");
    lp_ = NULL;
    freeAllMemory();
  }
}
#if CPX_VERSION >= 900
/**********************************************************************/
/* Returns 1 if can just do getBInv etc
   2 if has all OsiSimplex methods
   and 0 if it has none */
int OsiCpxSolverInterface::canDoSimplexInterface() const
{
  return 1;
}

/**********************************************************************/
bool OsiCpxSolverInterface::basisIsAvailable() const
{
  CPXLPptr lp = getMutableLpPtr();

  int solnmethod, solntype, pfeasind, dfeasind;

  int status = CPXsolninfo(env_, lp, &solnmethod, &solntype,
    &pfeasind, &dfeasind);
  if (status) {
    return false;
  }
  if (solntype == CPX_BASIC_SOLN) {
    return true;
  }
  return false;
}

/**********************************************************************/
/* CPLEX return codes: 
For cstat:
CPX_AT_LOWER   0 : variable at lower bound 
CPX_BASIC      1 : variable is basic 
CPX_AT_UPPER   2 : variable at upper bound 
CPX_FREE_SUPER 3 : variable free and non-basic 

For rstat:

Non ranged rows:
CPX_AT_LOWER 0 : associated slack/surplus/artificial variable non-basic 
                 at value 0.0 
CPX_BASIC    1 : associated slack/surplus/artificial variable basic 

Ranged rows:
CPX_AT_LOWER 0 : associated slack/surplus/artificial variable non-basic 
                 at its lower bound 
CPX_BASIC    1 : associated slack/surplus/artificial variable basic 
CPX_AT_UPPER 2 : associated slack/surplus/artificial variable non-basic 
                 at upper bound 

Cplex adds a slack with coeff +1 in <= and =, with coeff -1 in >=, slack being
non negative. We switch in order to get a "Clp tableau" where all the
slacks have coeff +1.

If a slack for >= is non basic, invB is not changed; column of the slack in
opt tableau is flipped.

If slack for >= is basic, corresp. row of invB is flipped; whole row of opt 
tableau is flipped; then whole column for the slack in opt tableau is flipped. 
*/

/* Osi return codes:
0: free  
1: basic  
2: upper 
3: lower
*/
void OsiCpxSolverInterface::getBasisStatus(int *cstat, int *rstat) const
{
  CPXLPptr lp = getMutableLpPtr();
  int status = CPXgetbase(env_, lp, cstat, rstat);
  if (status) {
    printf("### ERROR: OsiCpxSolverInterface::getBasisStatus(): Unable to get base\n");
    exit(1);
  }

  int ncol = getNumCols();
  int nrow = getNumRows();
  const int objsense = (int)getObjSense();
  const double *dual = getRowPrice();
  const double *row_act = getRowActivity();
  const double *rowLower = getRowLower();
  const double *rowUpper = getRowUpper();

  char *sense = new char[nrow];
  status = CPXgetsense(env_, lp, sense, 0, nrow - 1);

  if (status) {
    printf("### ERROR: OsiCpxSolverInterface::getBasisStatus(): Unable to get sense for the rows\n");
    exit(1);
  }

  for (int i = 0; i < ncol; i++) {
    switch (cstat[i]) {
    case 0:
      cstat[i] = 3;
      break;
    case 1:
      break;
    case 2:
      break;
    case 3:
      cstat[i] = 0;
      break;
    default:
      printf("### ERROR: OsiCpxSolverInterface::getBasisStatus(): unknown column status: %d\n", cstat[i]);
      break;
    }
  }

  if (objsense == 1) {

    for (int i = 0; i < nrow; i++) {
      switch (rstat[i]) {
      case 0:
        rstat[i] = 3;

        if (sense[i] == 'E') {
          if (dual[i] > 0) {
            rstat[i] = 2;
          }
        }

        if (sense[i] == 'R') {
          if (rowUpper[i] > rowLower[i] + 1e-6) {
            if (row_act[i] < rowUpper[i] - 1e-6) {
              rstat[i] = 2;
            }
          } else {
            if (dual[i] > 0) {
              rstat[i] = 2;
            }
          }
        }

        if (sense[i] == 'G') {
          rstat[i] = 2;
        }

        break;

      case 1:
        break;
      case 2:
        if (sense[i] == 'E') {
          if (dual[i] < 0) {
            rstat[i] = 3;
          }
        }

        if (sense[i] == 'R') {
          if (rowUpper[i] > rowLower[i] + 1e-6) {
            if (row_act[i] > rowLower[i] + 1e-6) {
              rstat[i] = 3;
            }
          } else {
            if (dual[i] < 0) {
              rstat[i] = 3;
            }
          }
        }

        break;
      default:
        printf("### ERROR: OsiCpxSolverInterface::getBasisStatus(): unknown row status: %d\n", rstat[i]);
        break;
      }
    }
  } else { // objsense == -1
    for (int i = 0; i < nrow; i++) {
      switch (rstat[i]) {
      case 0:
        rstat[i] = 3;

        if (sense[i] == 'E') {
          if (dual[i] < 0) {
            rstat[i] = 2;
          }
        }

        if (sense[i] == 'R') {
          if (rowUpper[i] > rowLower[i] + 1e-6) {
            if (row_act[i] < rowUpper[i] - 1e-6) {
              rstat[i] = 2;
            }
          } else {
            if (dual[i] < 0) {
              rstat[i] = 2;
            }
          }
        }

        if (sense[i] == 'G') {
          rstat[i] = 2;
        }

        break;

      case 1:
        break;
      case 2:
        if (sense[i] == 'E') {
          if (dual[i] > 0) {
            rstat[i] = 3;
          }
        }

        if (sense[i] == 'R') {
          if (rowUpper[i] > rowLower[i] + 1e-6) {
            if (row_act[i] > rowLower[i] + 1e-6) {
              rstat[i] = 3;
            }
          } else {
            if (dual[i] > 0) {
              rstat[i] = 3;
            }
          }
        }

        break;
      default:
        printf("### ERROR: OsiCpxSolverInterface::getBasisStatus(): unknown row status: %d\n", rstat[i]);
        break;
      }
    }
  }
  delete[] sense;
}

/**********************************************************************/
void OsiCpxSolverInterface::getBInvARow(int row, double *z, double *slack)
  const
{

  CPXLPptr lp = getMutableLpPtr();

  int nrow = getNumRows();
  int ncol = getNumCols();
  char *sense = new char[nrow];
  int status = CPXgetsense(env_, lp, sense, 0, nrow - 1);
  if (status) {
    printf("### ERROR: OsiCpxSolverInterface::getBInvARow(): Unable to get senses for the rows\n");
    exit(1);
  }

  status = CPXbinvarow(env_, lp, row, z);
  if (status) {
    printf("### ERROR: OsiCpxSolverInterface::getBInvARow(): Unable to get row %d of the tableau\n", row);
    exit(1);
  }

  if (slack != NULL) {
    status = CPXbinvrow(env_, lp, row, slack);
    if (status) {
      printf("### ERROR: OsiCpxSolverInterface::getBInvARow(): Unable to get row %d of B inverse\n", row);
      exit(1);
    }

    // slack contains now the row of BInv(cplex);
    // slack(cplex) is obtained by flipping in slack all entries for >= constr
    // slack(clp) is obtained by flipping the same entries in slack(cplex)
    // i.e. slack(clp) is the current slack.
  }

  if (sense[row] == 'G') {
    int *ind_bas = new int[nrow];
    int ind_slack = ncol + row;
    getBasics(ind_bas);
    for (int i = 0; i < nrow; i++) {
      if (ind_bas[i] == ind_slack) { // slack for row is basic; whole row
        // must be flipped
        for (int j = 0; j < nrow; j++) {
          z[j] = -z[j];
        }
        if (slack != NULL) {
          for (int j = 0; j < nrow; j++) {
            slack[j] = -slack[j];
          }
        }
      }
      break;
    }
    delete[] ind_bas;
  }
  delete[] sense;
} /* getBInvARow */

/**********************************************************************/
void OsiCpxSolverInterface::getBInvRow(int row, double *z) const
{

  CPXLPptr lp = getMutableLpPtr();

  int nrow = getNumRows();
  int ncol = getNumCols();

  int status = CPXbinvrow(env_, lp, row, z);
  if (status) {
    printf("### ERROR: OsiCpxSolverInterface::getBInvRow(): Unable to get row %d of the basis inverse\n", row);
    exit(1);
  }
  int *ind_bas = new int[nrow];
  getBasics(ind_bas);
  if (ind_bas[row] >= ncol) { // binv row corresponds to a slack variable
    int Arow = ind_bas[row] - ncol; // Arow is the number of the row in the problem matrix which this slack belongs to
    char sense;
    status = CPXgetsense(env_, lp, &sense, Arow, Arow);
    if (status) {
      printf("### ERROR: OsiCpxSolverInterface::getBInvRow(): Unable to get senses for row %d\n", Arow);
      exit(1);
    }
    if (sense == 'G') { // slack has coeff -1 in Cplex; thus row in binv must be flipped
      for (int j = 0; j < nrow; j++) {
        z[j] = -z[j];
      }
    }
  }
  delete[] ind_bas;
  /*  
  char sense;
  status = CPXgetsense(env_, lp, &sense, row, row);
  if(status) {
    printf("### ERROR: OsiCpxSolverInterface::getBInvRow(): Unable to get senses for row %d\n", row);
    exit(1);
  }
  
  if(sense == 'G') {
    int *ind_bas = new int[nrow];
    getBasics(ind_bas);

    for(int i=0; i<nrow; i++) {
      int ind_piv = ind_bas[i] - ncol;
      if(ind_piv == row) {  
                           // slack has coeff -1 in Cplex and is basic; 
                           // row of invB must be flipped

	for(int j=0; j<nrow; j++) {
	  z[j] = -z[j];
	}
	break;
      }
    }
    delete[] ind_bas;
  }
*/
} /* getBInvRow */

/**********************************************************************/
void OsiCpxSolverInterface::getBInvACol(int col, double *vec) const
{

  CPXLPptr lp = getMutableLpPtr();

  int status = CPXbinvacol(env_, lp, col, vec);
  if (status) {
    printf("### ERROR: OsiCpxSolverInterface::getBInvACol(): Unable to get column %d of the tableau\n", col);
    exit(1);
  }

  int nrow = getNumRows();
  int ncol = getNumCols();
  char *sense = new char[nrow];
  status = CPXgetsense(env_, lp, sense, 0, nrow - 1);
  if (status) {
    printf("### ERROR: OsiCpxSolverInterface::getBInvACol(): Unable to get senses for the rows\n");
    exit(1);
  }
  int *ind_bas = new int[nrow];
  getBasics(ind_bas);

  for (int i = 0; i < nrow; i++)
    if (ind_bas[i] > ncol && sense[ind_bas[i] - ncol] == 'G')
      vec[i] = -vec[i]; // slack for row is basic; whole row must be flipped

  delete[] sense;
  delete[] ind_bas;
} /* getBInvACol */

/**********************************************************************/
void OsiCpxSolverInterface::getBInvCol(int col, double *vec) const
{

  CPXLPptr lp = getMutableLpPtr();

  int status = CPXbinvcol(env_, lp, col, vec);
  if (status) {
    printf("### ERROR: OsiCpxSolverInterface::getBInvCol(): Unable to get column %d of the basis inverse\n", col);
    exit(1);
  }

  int nrow = getNumRows();
  int ncol = getNumCols();
  char *sense = new char[nrow];
  status = CPXgetsense(env_, lp, sense, 0, nrow - 1);
  if (status) {
    printf("### ERROR: OsiCpxSolverInterface::getBInvCol(): Unable to get senses for the rows\n");
    exit(1);
  }
  int *ind_bas = new int[nrow];
  getBasics(ind_bas);

  for (int i = 0; i < nrow; i++)
    if (ind_bas[i] > ncol && sense[ind_bas[i] - ncol] == 'G')
      vec[i] = -vec[i]; // slack for row i is basic; whole row must be flipped

  delete[] sense;
  delete[] ind_bas;
} /* getBInvCol */

/**********************************************************************/
void OsiCpxSolverInterface::getBasics(int *index) const
{
  int ncol = getNumCols();
  int nrow = getNumRows();

  CPXLPptr lp = getMutableLpPtr();

  double *cplex_trash = new double[nrow];
  int status = CPXgetbhead(env_, lp, index, cplex_trash);
  if (status) {
    printf("### ERROR: OsiCpxSolverInterface::getBasics(): Unable to get basis head\n");
    exit(1);
  }

  for (int i = 0; i < nrow; i++) {
    if (index[i] < 0) {
      index[i] = ncol - 1 - index[i];
    }
  }
  delete[] cplex_trash;
} /* getBasics */

#else /* not CPX_VERSION >= 900 */

/**********************************************************************/
/* Returns 1 if can just do getBInv etc
   2 if has all OsiSimplex methods
   and 0 if it has none */
int OsiCpxSolverInterface::canDoSimplexInterface() const
{
  return 0;
}

/**********************************************************************/
bool OsiCpxSolverInterface::basisIsAvailable() const
{
  printf("### ERROR: OsiCpxSolverInterface::basisIsAvailable(): Cplex version lower than 9.0\n");
  exit(1);
  return false;
}

/**********************************************************************/
void OsiCpxSolverInterface::getBasisStatus(int *cstat, int *rstat) const
{
  printf("### ERROR: OsiCpxSolverInterface::getBasisStatus(): Cplex version lower than 9.0\n");
  exit(1);
}

/**********************************************************************/
void OsiCpxSolverInterface::getBInvARow(int row, double *z, double *slack)
  const
{
  printf("### ERROR: OsiCpxSolverInterface::getBInvARow(): Cplex version lower than 9.0\n");
  exit(1);
} /* getBInvARow */

/**********************************************************************/
void OsiCpxSolverInterface::getBInvRow(int row, double *z) const
{
  printf("### ERROR: OsiCpxSolverInterface::getBInvRow(): Cplex version lower than 9.0\n");
  exit(1);
} /* getBInvRow */

/**********************************************************************/
void OsiCpxSolverInterface::getBInvACol(int col, double *vec) const
{
  printf("### ERROR: OsiCpxSolverInterface::getBInvACol(): Cplex version lower than 9.0\n");
  exit(1);
} /* getBInvACol */

/**********************************************************************/
void OsiCpxSolverInterface::getBInvCol(int col, double *vec) const
{
  printf("### ERROR: OsiCpxSolverInterface::getBInvCol(): Cplex version lower than 9.0\n");
  exit(1);
} /* getBInvCol */

/**********************************************************************/
void OsiCpxSolverInterface::getBasics(int *index) const
{
  printf("### ERROR: OsiCpxSolverInterface::getBasics(): Cplex version lower than 9.0\n");
  exit(1);
} /* getBasics */
#endif /* not CPX_VERSION >= 900 */

/* vi: softtabstop=2 shiftwidth=2 expandtab tabstop=2
*/
